feature: Adds OnItemRefreshed extension method for SourceList and SourceCache

[tomasfil]

Adds OnItemRefreshed extension method for SourceList and SourceCache.

Implementation comes from the way OnItemAdded and OnItemRemoved methods are implemented.

Function:
Executes defined action, when item with ChangeReason.Refreshed comes through the pipeline.

[glennawatson]

Probably worth editing the description of the PR with some more details. Just so @RolandPheasant can tell what's going on and also users checking the release notes.

[glennawatson]

I noticed the PR template disappeared, apologies for that. Will fix that up but thanks for the edit to make it more clear.

[glennawatson]

just some compile errors based on our analyzers.

Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error RCS1037: Remove trailing white-space. [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]
Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error SA1028: Code should not contain trailing whitespace [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]
Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error RCS1037: Remove trailing white-space. [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]
Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error SA1028: Code should not contain trailing whitespace [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]
Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error RCS1037: Remove trailing white-space. [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]
Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error SA1028: Code should not contain trailing whitespace [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]
Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error RCS1037: Remove trailing white-space. [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]
Error: D:\a\DynamicData\DynamicData\src\DynamicData\Cache\ObservableCacheEx.cs(2830,171): error SA1028: Code should not contain trailing whitespace [D:\a\DynamicData\DynamicData\src\DynamicData\DynamicData.csproj]

Also thinking about it I think @RolandPheasant would love some unit tests for this new functionality.

[tomasfil]

Added unit test for the new refreshed method and also added equivalent missing tests for List

[RolandPheasant]

Looks good, and thanks for the contribution.

[github-actions]

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