feat(react-dom): Add enterKeyHint

[eps1lon]

Summary

-<input enterkeyhint="search" />
+<input enterKeyHint="search" />

• WHATWG spec
• Chrome Platform Status
• supported in chrome 77, safari 13.1, firefox intents to implement it

Test Plan

Ran /fixtures/attribute-behavior locally. Results available under https://drive.google.com/open?id=1j5PJgc-NcKXsGZh8GqBfHXHfdEwd9ii_.

Note: Should I update the fixture for inputMode as well? It is still reading from the attribute but the property is supported as of chrome 66.

react/fixtures/attribute-behavior/src/attributes.js

Line 955 in 8c75389

{name: 'inputMode', tagName: 'input', read: getAttribute('inputmode')}, // TODO: Should use property but it's not implemented in Chrome

Codesandbox using this PR: https://codesandbox.io/s/enterkeyhint-6l5t3

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[eps1lon]

deleted by accident

[stale]

This pull request has been automatically marked as stale. If this pull request is still relevant, please leave any comment (for example, "bump"), and we'll keep it open. We are sorry that we haven't been able to prioritize reviewing it yet. Your contribution is very much appreciated.

[eps1lon]

bump

[gaearon]

Looks like we forgot to merge. Thanks!