Feature: List MergeManyChangeSets for Cache ChangeSets (#744)

* Updated List to have same new MergeMany behavior

* Added List -> Cache Merge ChangeSets and MergeChangeSets for Cache

* All unit tests pass except for 2

* More tests

* Revert changes that are moved to another PR

* Still blocked on Replace test

* Clean up

* Add replace tests

* Test improvements

* Fix broken tests

* Fixed Operator and Unit Tests

* Added new Extension methods to verified API files

---------

Co-authored-by: Roland Pheasant <roland_pheasant@hotmail.com>
Co-authored-by: Chris Pulman <chris.pulman@yahoo.com>

src/DynamicData.Tests/API/ApiApprovalTests.DynamicDataTests.DotNet6_0.verified.txt

@@ -2079,6 +2079,14 @@ namespace DynamicData
             where T :  notnull { }
         public static System.IObservable<TDestination> MergeMany<T, TDestination>(this System.IObservable<DynamicData.IChangeSet<T>> source, System.Func<T, System.IObservable<TDestination>> observableSelector)
             where T :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>> MergeManyChangeSets<TObject, TDestination, TDestinationKey>(this System.IObservable<DynamicData.IChangeSet<TObject>> source, System.Func<TObject, System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>>> observableSelector, System.Collections.Generic.IComparer<TDestination> comparer)
+            where TObject :  notnull
+            where TDestination :  notnull
+            where TDestinationKey :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>> MergeManyChangeSets<TObject, TDestination, TDestinationKey>(this System.IObservable<DynamicData.IChangeSet<TObject>> source, System.Func<TObject, System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>>> observableSelector, System.Collections.Generic.IEqualityComparer<TDestination>? equalityComparer = null, System.Collections.Generic.IComparer<TDestination>? comparer = null)
+            where TObject :  notnull
+            where TDestination :  notnull
+            where TDestinationKey :  notnull { }
         public static System.IObservable<DynamicData.IChangeSet<T>> NotEmpty<T>(this System.IObservable<DynamicData.IChangeSet<T>> source)
             where T :  notnull { }
         public static System.IObservable<DynamicData.IChangeSet<T>> OnItemAdded<T>(this System.IObservable<DynamicData.IChangeSet<T>> source, System.Action<T> addAction)

src/DynamicData.Tests/API/ApiApprovalTests.DynamicDataTests.DotNet7_0.verified.txt

@@ -2079,6 +2079,14 @@ namespace DynamicData
             where T :  notnull { }
         public static System.IObservable<TDestination> MergeMany<T, TDestination>(this System.IObservable<DynamicData.IChangeSet<T>> source, System.Func<T, System.IObservable<TDestination>> observableSelector)
             where T :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>> MergeManyChangeSets<TObject, TDestination, TDestinationKey>(this System.IObservable<DynamicData.IChangeSet<TObject>> source, System.Func<TObject, System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>>> observableSelector, System.Collections.Generic.IComparer<TDestination> comparer)
+            where TObject :  notnull
+            where TDestination :  notnull
+            where TDestinationKey :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>> MergeManyChangeSets<TObject, TDestination, TDestinationKey>(this System.IObservable<DynamicData.IChangeSet<TObject>> source, System.Func<TObject, System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>>> observableSelector, System.Collections.Generic.IEqualityComparer<TDestination>? equalityComparer = null, System.Collections.Generic.IComparer<TDestination>? comparer = null)
+            where TObject :  notnull
+            where TDestination :  notnull
+            where TDestinationKey :  notnull { }
         public static System.IObservable<DynamicData.IChangeSet<T>> NotEmpty<T>(this System.IObservable<DynamicData.IChangeSet<T>> source)
             where T :  notnull { }
         public static System.IObservable<DynamicData.IChangeSet<T>> OnItemAdded<T>(this System.IObservable<DynamicData.IChangeSet<T>> source, System.Action<T> addAction)

src/DynamicData.Tests/API/ApiApprovalTests.DynamicDataTests.DotNet8_0.verified.txt

@@ -2079,6 +2079,14 @@ namespace DynamicData
             where T :  notnull { }
         public static System.IObservable<TDestination> MergeMany<T, TDestination>(this System.IObservable<DynamicData.IChangeSet<T>> source, System.Func<T, System.IObservable<TDestination>> observableSelector)
             where T :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>> MergeManyChangeSets<TObject, TDestination, TDestinationKey>(this System.IObservable<DynamicData.IChangeSet<TObject>> source, System.Func<TObject, System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>>> observableSelector, System.Collections.Generic.IComparer<TDestination> comparer)
+            where TObject :  notnull
+            where TDestination :  notnull
+            where TDestinationKey :  notnull { }
+        public static System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>> MergeManyChangeSets<TObject, TDestination, TDestinationKey>(this System.IObservable<DynamicData.IChangeSet<TObject>> source, System.Func<TObject, System.IObservable<DynamicData.IChangeSet<TDestination, TDestinationKey>>> observableSelector, System.Collections.Generic.IEqualityComparer<TDestination>? equalityComparer = null, System.Collections.Generic.IComparer<TDestination>? comparer = null)
+            where TObject :  notnull
+            where TDestination :  notnull
+            where TDestinationKey :  notnull { }
         public static System.IObservable<DynamicData.IChangeSet<T>> NotEmpty<T>(this System.IObservable<DynamicData.IChangeSet<T>> source)
             where T :  notnull { }
         public static System.IObservable<DynamicData.IChangeSet<T>> OnItemAdded<T>(this System.IObservable<DynamicData.IChangeSet<T>> source, System.Action<T> addAction)