[Feature Request] Expand vim mode keybinding support for yank, paste, undo, and redo

Question

**Bug Description**

Vim mode is currently missing some essential editing commands that would make it more usable for vim users:

Yank (copy) commands:
  - y - yank with motion
  - yy / Y - yank line
  - yw / ye / yb - yank word variants
  - p / P - paste after/before cursor

Undo/redo:
  - u - undo
  - Ctrl+R - redo (would need to coexist with or replace reverse history search)

These are fundamental vim operations and their absence makes it difficult to stay in vim mode for editing lon