Able to add thead / tfoot to table block

[spacedmonkey]

Is your feature request related to a problem? Please describe.
When creating a table block in the editor, users are enable to create a table header and footer. Table headers are defined using thead tag and footers are defined using tfoot tag. Table headers and footers are an important part of making table accessible

Describe the solution you'd like
When a table block is created, this screen is shown.

There should be two new checkbox, that say
"Create with table header".
"Create with table footer".

This would create the table block with the thead / tfoot / th tags. These headers and footers, may also require some styling to denote there difference.

[spacedmonkey]

Close as fixed in #15409