fix: Support custom tag ordering

[spanglerco]

Pull Request

Description

Makes OpenApiDocument.Tags preserve the provided set when it is a HashSet with custom comparer, a SortedSet, or an ImmutableSortedSet (not available when targeting netstandard2.0). Previously, the setter would make a copy of the set using an internal comparer.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe):

Related Issue(s)

Fixes #2678

Changes Made

• Update the OpenApiDocument.Tags setter to preserve sets with a custom comparer and sorted sets

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All existing tests pass

Checklist

• My code follows the code style of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Versions applicability

• My change applies to the version 1.X of the library, if so PR link:
• My change applies to the version 2.X of the library, if so PR link:
• My change applies to the version 3.X of the library, if so PR link:
• I have evaluated the applicability of my change against the other versions above.

See the contributing guidelines for more information about how patches are applied across multiple versions.

Additional Notes

This PR targets support/v2 per the comments in the related issue. Let me know if I should rebase onto main instead.

[baywet]

Thanks for the contribution!