Table - add support for tfoot

[mcoker]

Need to add support for the <tfoot> element, and it should support being sticky via .pf-m-sticky-footer, and .pf-m-sticky-footer-stuck.

Priority - I'm not aware of any open requests for this feature, so low priority - it's something that came out of the glass POC work.

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Jira Issue: PF-3996

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[kmcfaul]

Dynamic sticky footer should be a separate issue - needs core support still.