Create Vets::Collection

[stevenjcumming]

This is parent branch that will be merged when other PRs are merged into itself

Summary

• Vets::Collection allows array of Vets::Model models to be sorted, filtered, or paginated.
• Vets::Collection can also be created from an array of hashes or WillPaginate::Collections

I will review & update metadata & errors between Vets Model and Collection in another PR

Related issue(s)

• Create Vets::Collection with primary Common::Collection functionality va.gov-team#99123
• pagination: Add pagination info to Vets::Collection #20095
• sorting: Add sortability to Vets::Collection #19896
• filtering: Add filtering info to Vets::Collection #20162

Testing done

• New specs created
• Manual testing

Acceptance criteria

• Copies functionality (sorted, filtered, paginated) of Common::Collection

[github-actions]

1 Error

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This PR changes 549 LoC (not counting whitespace/newlines). In order to ensure each PR receives the proper attention it deserves, those exceeding 500 will not be reviewed, nor will they be allowed to merge. Please break this PR up into smaller ones. If you have reason to believe that this PR should be granted an exception, please see the Submitting pull requests for approval - FAQ. File Summary Files lib/vets/collection.rb (+78/-0) lib/vets/collections/finder.rb (+62/-0) lib/vets/collections/pagination.rb (+41/-0) spec/lib/vets/collection_spec.rb (+243/-0) spec/lib/vets/collections/finder_spec.rb (+78/-0) spec/lib/vets/collections/pagination_spec.rb (+47/-0) Note: We exclude files matching the following when considering PR size: *.csv, *.json, *.tsv, *.txt, *.md, Gemfile.lock, app/swagger, modules/mobile/docs, spec/fixtures/, spec/support/vcr_cassettes/, modules/mobile/spec/support/vcr_cassettes/, db/seeds, modules/vaos/app/docs, modules/meb_api/app/docs, modules/appeals_api/app/swagger/, *.bru, *.pdf Big PRs are difficult to review, often become stale, and cause delays.

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[stevenjcumming]

I'm putting this in draft until I can review with Eric