SourceList Overloads for MergeChangeSets for Cache ChangeSets

[dwcullop]

Description

Adds overloads for ISourceList to enable using MergeChangeSets for Cache Observable ChangeSets just like one can invoke similar to IEnumerable<IObservable<IChangeSet<TObject, TKey>>>`.

Just some syntactic sugar that I think would be helpful for some users to find the functionality.

It also supports IObservable<IChangeSet<IObservable<IChangeSet<TObject, TKey>>>> for list changesets of cache changesets.

[codecov]

Codecov Report

Attention: 425 lines in your changes are missing coverage. Please review.

Comparison is base (53d5f6d) 64.74% compared to head (292fb8f) 65.80%.
Report is 7 commits behind head on main.

Files	Patch %	Lines
src/DynamicData/Cache/ObservableCacheEx.cs	53.48%	19 Missing and 1 partial ⚠️
src/DynamicData/List/ObservableListEx.cs	67.79%	16 Missing and 3 partials ⚠️
src/DynamicData/List/Internal/Transformer.cs	52.00%	9 Missing and 3 partials ⚠️
src/DynamicData/Aggregation/AvgEx.cs	73.68%	10 Missing ⚠️
src/DynamicData/Aggregation/SumEx.cs	74.35%	10 Missing ⚠️
src/DynamicData/ObservableChangeSet.cs	58.33%	10 Missing ⚠️
src/DynamicData/Platforms/net45/ParallelEx.cs	25.00%	7 Missing and 2 partials ⚠️
src/DynamicData/Aggregation/StdDevEx.cs	76.66%	5 Missing and 2 partials ⚠️
src/DynamicData/List/Internal/GroupOnProperty.cs	0.00%	7 Missing ⚠️
src/DynamicData/Aggregation/CountEx.cs	25.00%	6 Missing ⚠️
... and 127 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #763      +/-   ##
==========================================
+ Coverage   64.74%   65.80%   +1.06%     
==========================================
  Files         226      228       +2     
  Lines       11459    11181     -278     
  Branches     2334     2307      -27     
==========================================
- Hits         7419     7358      -61     
+ Misses       3083     2884     -199     
+ Partials      957      939      -18     

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[sonarcloud]

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[github-actions]

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