Add a watch mode

[MSmaili]

A watch mode will help to notify Neovim that something has changed, for example, we use AI to make changes, and AI has made changes to the current file. Instead of just replacing the file, we notify that the file has changed.

It can be quite similar to how Sidekick is doing, but with the option to disable it completely in case someone does want it.
https://github.com/folke/sidekick.nvim/blob/main/lua/sidekick/cli/watch.lua

[MSmaili]

Until now i did not see a need for this, but keeping it open and can add it later