[Docs] Provide nixified version of tableplus

Summary:
I tried to keep D4967 mostly true to the existing documentation.
TablePlus required some changes, so separated it into another revision.

Depends on D4969

Test Plan:
Read
https://github.com/CommE2E/comm/blob/jonringer/nix-dev-docs/docs/nix_shared_workflows.md#inspect-database-with-tableplus

Reviewers: ashoat, varun

Reviewed By: ashoat

Subscribers: tomek, atul

Differential Revision: https://phab.comm.dev/D4970