Implement tables.get rpc endpoint

[Anish9901]

Fixes #3611

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[mathemancer]

I have either one change to request, or a choice you made that I need to have explained to me: Why use get_ rather than get in the RPC function?

• It makes the docs a little wonky, and
• Using the trailing underscore is typically reserved for situations where you want to avoid colliding with a keyword in python.

[mathemancer]

I don't understand why you went with get_ here. get isn't a keyword, is it?

[Anish9901]

You are right, I erroneously thought it was a keyword. I've changed it to get.

[mathemancer]

Should be exposed as get regardless.

[mathemancer]

Okay, I think this is good to go once the tests pass.