Add bindings for crdt.el's menu modes

[jming422]

trafficstars

Brief summary of what the package does

Adds normal state bindings for crdt.el's menu modes. These modes have default bindings which work as expected when in insert state, but not in normal state. This PR adds bindings that add expected functionality while in normal state, which is these menu buffers' default. The RET bindings in particular are very helpful; the others are mostly icing on the cake.

Direct link to the package repository

https://code.librehq.com/qhong/crdt.el

Checklist

Assume you're working on crdt mode:

• [x] byte-compiles cleanly
• [x] M-x checkdoc is happy. Don't manually write (provide 'evil-collection-crdt), M-x checkdoc can do it automatically for you
• [x] define evil-collection-crdt-setup with defun
• [x] define evil-collection-crdt-mode-maps with defconst
• [x] All functions should start with evil-collection-crdt-