dennisdoomen / fluentassertions / 29638488165

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Add BeSupersetOf, BeProperSubsetOf and BeProperSupersetOf collection assertions

Ports the work originally submitted in PR #2432 by @Meir017, adapted to
the current AssertionChain-based assertion API. The original PR could
not be reopened because its base branch (develop) no longer exists.

- Add ConvertOrCastToSet extension to EnumerableExtensions
- Extract AssertSubsetOf and AssertContainment helpers in
  GenericCollectionAssertions to share logic with the new assertions
- Add BeSupersetOf, BeProperSubsetOf and BeProperSupersetOf methods
- Add spec tests ported from the original PR
- Update collections.md docs and releases.md

Co-authored-by: Meir017 <Meir017@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

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