[FEATURE]: /undo and /redo support for ACP

[Kallemakela]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

/undo and /redo support for ACP

Related:

• Closed issue Feature: Expose TUI Session Management Commands via ACP (for Zed integration) #8931
• Old PR feat(acp): session management v2 #11500 for the closed issue Feature: Expose TUI Session Management Commands via ACP (for Zed integration) #8931