Required states can come from native elements [4e8ab6]

@JAWS-test

This came from a comment from @JAWS-test on a review

The following shouldn't fail the Element with role attribute has required states and properties rule. The checked state is present even without the aria-checked attribute, because it is on a native checkbox.

<input type="checkbox" role="menuitemcheckbox">

Decision:

we need "implicitly set" and "explicitly set" definitions.
"required state" rule should accept implicitly set states (i.e., this example is good, there is no author error)
"allowed states" rule should only flagged explicitly set states (i.e. <input type="checkbox" role="button"> shouldn't be flagged for un-allowed aria-checked since it is not an author error).

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