[draft] Table accessibility: Add accessible markup on content updates

[zandercymatics]

Issue description

For users using screenreaders, our tables currently do not provide enough information during content update (i.e. searching, data load, or when no data is found). Because we update these tables using ajax, it appears as though no change has occurred for this user. Additionally, there isn't an easy way to tab through each row of content.

This ticket aims to address that by making ajax-based table updates more accessible.

Acceptance criteria

• Provide accessible markup to allow users to tab to each record of the table
• On search, focus should be brought to the table programmatically so that users don't have to tab into the table
• When a user completes a search query that has zero results, the tab focus should be brought to the table and ANDI output should be "No results found"
• aria-live is updated during search to reflect if either no data is found

Additional context

See this slack thread for more context.

Links to other issues

• 🔄 Design: Review member permissions in registrar (limited scope) #3280