React dom invalid aria hook (#7744)

* Add a hook that throws a runtime warning for invalid WAI ARIA attributes and values.

* Resolved linting errors.

* Added a test case for many props.

* Added a test case for ARIA attribute proper casing.

* Added a warning for uppercased attributes to ReactDOMInvalidARIAHook

warnings/invalid-aria-prop.md

@@ -0,0 +1,11 @@
+---
+title: Invalid ARIA Prop Warning
+layout: single
+permalink: warnings/invalid-aria-prop.html
+---
+
+The invalid-aria-prop warning will fire if you attempt to render a DOM element with an aria-* prop that does not exist in the Web Accessibility Initiative (WAI) Accessible Rich Internet Application (ARIA) [specification](https://www.w3.org/TR/wai-aria-1.1/#states_and_properties).
+
+1. If you feel that you are using a valid prop, check the spelling carefully. `aria-labelledby` and `aria-activedescendant` are often misspelled.
+
+2. React does not yet recognize the attribute you specified. This will likely be fixed in a future version of React. However, React currently strips all unknown attributes, so specifying them in your React app will not cause them to be rendered