Allow users to edit the table datasource schema from the explore view

[hughhhh]

Currently there is now way to edit the datasource metadata without hardcoding the url params. For example localhost/tablemodelview/edit/1. We should re add the button to allow users to have the proper flow or add these fields to the new tableview modal.

[leakingoxide]

After consultation with hughhhh I'm picking this up, hope to deliver something in the few days.

[mistercrunch]

Here: #6046 , worked on this a little while back but never wrapped it up. Let me rebase and update the PR.