Ensure value and defaultValue do not assign functions and symbols (#11741)

* Ensure value and defaultValue do not assign functions and symbols

* Eliminate assignProperty method from ReactDOMInput

* Restore original placement of defaultValue reservedProp

* Reduce branching. Make assignment more consistent

* Control for warnings in symbol/function tests

* Add boolean to readOnly assignments

* Tweak the tests

* Invalid value attributes should convert to an empty string

* Revert ChangeEventPlugin update. See #11746

* Format

* Replace shouldSetAttribute call with value specific type check

DOMProperty.shouldSetAttribute runs a few other checks that aren't
appropriate for determining if a value or defaultValue should be
assigned on an input. This commit replaces that call with an input
specific check.

* Remove unused import

* Eliminate unnecessary numeric equality checks (#11751)

* Eliminate unnecessary numeric equality checks

This commit changes the way numeric equality for number inputs works
such that it compares against `input.valueAsNumber`. This eliminates
quite a bit of branching around numeric equality.

* There is no need to compare valueAsNumber

* Add test cases for empty string to 0.

* Avoid implicit boolean JSX props

* Split up numeric equality test to isolate eslint disable command

* Fix typo in ReactDOMInput test

* Add todos

* Update the attribute table