Use schemas RPC APIs in the front end on the database page

[seancolsen]

Notes

This PR implements the front end side of our RPC refactor for the following REST endpoints:

Endpoint	HTTP Method	Function
/api/db/v0/schemas/{schemaId}/	DELETE	schemas.delete
/api/db/v0/schemas/{schemaId}/	PATCH	schemas.patch
/api/db/v0/schemas/	GET	schemas.list
/api/db/v0/schemas/	POST	schemas.add

Working functionality

• Everything on the database page including listing schemas, adding schemas, editing schemas, and deleting schemas

Notable user-facing changes

• Exploration counts are removed from each schema card

  Before	After

  We discussed this previously and made this choice in order to simplify implementation.

Broken functionality

Basically every other page of Mathesar is broken except for the root page which shows connections.

For example, the schema page looks like this:

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[seancolsen]

Heads up that I just realized that common_data is still broken here. The schemas load when the page is loaded client-side, but not when it's loaded fully from the server. I think I'd like to handle that in a separate PR.

[seancolsen]

Thanks @Anish9901, that works.

[seancolsen]

Marking as a draft because I realized that some more changes are needed to the front end data structures.

[seancolsen]

Sorry — never mind. After some additional digging, I the problem I though I had identified was not actually there.

Ready for review now.