feat(formAssociated): enables formAssociated components (using ElementInternals)

[johnjenkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been reviewed and added / updated if needed (for bug fixes / features)
• [ ] Build (npm run build) was run locally and any changes were pushed
• [ ] Unit tests (npm test) were run locally and passed
• [ ] E2E Tests (npm run test.karma.prod) were run locally and passed
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Pull request type

Please check the type of change your PR introduces:

• [ ] Bugfix
• [x] Feature
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation content changes
• [ ] Other (please describe):

What is the current behavior?

GitHub Issue Number: N/A

What is the new behavior?

Does this introduce a breaking change?

• [ ] Yes
• [ ] No

Testing

Other information

[alvarocjunq]

Looking forward for it 👍

[tanner-reits]

Hi John!

Just wanted to let ya know that we added support for Form Associated Custom Elements and Element Internals as a part of today's v4.5.0 release! We appreciate your contribution, but gonna get this closed out.