Add option for custom aria-describedby

[Superman2971]

Provides support for issues: #5562 and #1570

I've tested my fork on local repository to confirm this does indeed pass the provided aria-describedby to the react-select. Also tested and passed the yarn lint, yarn type-check, and yarn test per CONTRIBUTING.MD

Our team needs this implemented to meet a11y support for our use of react-select. We have some custom hint and error messaging that is related to the Select and needs to be accessibly connected through aria-describedby. I'm hoping we can contribute to the library and make this available in a minor update to the package. Please let me know what I can do to assist in getting this PR approved and ready to merge :) Cheers!

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[Superman2971]

I'm afraid I can't re-run the unit tests and I'm unsure why the tests aren't running in CircleCI.

Locally all tests are running and pass (new test included)

Hopefully this won't block the PR from moving forward. Let me know any progress I can make for this on my end and I'll jump on it.

[plahteenlahti]

Hey @Superman2971 I think your test is correct but you just need to run prettier:check and fix the error, which I think is that

'aria-describedby': this.props['aria-describedby'] || this.getElementId('placeholder'),

should be on two lines to so that it goes under the max line length of prettiest default setting

[Superman2971]

you just need to run prettier:check and fix the error

Thank you @plahteenlahti! That was a good catch 👍 Now fixed 😄 ✅