List-to-List MergeManyChangeSets

[dwcullop]

Description

Implements the MergeManyChangeSets operator for cases when both the Parent and Child ChangeSets are List Changes. It requires only a single prototype:

IObservable<IChangeSet<TDestination>> MergeManyChangeSets<TObject, TDestination>(this IObservable<IChangeSet<TObject>> source, Func<TObject, IObservable<IChangeSet<TDestination>>> observableSelector);

The implementation is very similar to the Cache version except the Change Tracker is much simpler because it doesn't have to deal with duplicate keys.

Testing

In addition to verifying Null handling and OnComplete/OnError behavior, the Unit Tests cover the following operations for both the Source and Child lists:

1. Add
2. AddRange
3. Insert
4. Remove
5. RemoveAt
6. RemoveMany
7. RemoveRange
8. Replace
9. Clear

Other Changes

Other changes include:

1. Adding use of Bogus library to generate test data
2. Various code modernization changes consistent with similar recent efforts
3. Minor comment improvements

[RolandPheasant]

Looks great to me. Low risk, and I'm sure you'll test them all out on your daytime projects.

[github-actions]

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