aria-required-children should map to ACT rule ARIA required context role (ff89c9)

[WilcoFiers]

In order to avoid duplicate issues, axe-core's aria-required-parent rule does not fail the following, and leaves the testing of this up to aria-required-children.

<div role="list">
  <div aria-live="polite">
    <div role="listitem">item</div>
  </div>
</div>

To ensure correct mapping with ACT though, we need to add ARIA required context role (ff89c9) to the aria-required-children rule.

[padmavemulapati]

Validated with the 'axe-core' develop branch code base,
test snippet:

<div role="list">
  <div aria-live="polite">
    <div role="listitem">item</div>
  </div>
</div>

aria-required-parent is not failing for the test script, but failing for aria-required-children