Enhance accessibility for Checkbox with ARIA roles

[keul]

I'm submitting a ... (check one with "x")

[ ] bug report
[x] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

Current behavior

The Checkbox element is accessible using keyboard and provide focus behavior, but there's no usage of ARIA roles. See https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/checkbox_role

Expected behavior
Add ARIA role to Checkbox's div:

<div class="p-checkbox-box p-component p-highlight" role="checkbox" aria-checked="true">
...

Also: the Checbkox component (maybe lot of other orimereact components) should accept and render a aria-labelledby attribute in case the user provide it.

[efc]

Please note that this issue was closed even though the aria-labelledby attribute has not been implemented for prime-react input components. I need this to implement special labels for some Dropdown components, for example. I've opened issue #839 for this.