Add a callback before applying changes to the files.

[antosha417]

What do you think about adding a callback that will be called before codecompanion would apply the chages to the file?

My use case is that I want to commit that file automatically before any changes are applied to it.

[olimorris]

Totally up for this. Perhaps if in the config we have something like:

tools = {
  ["editor"] = {
    callback = "strategies.chat.tools.editor",
    description = "Update a buffer with the LLM's response",
    opts = {
      handlers = {
        after = function() end,
      }
    }
  },
}

Would welcome this as a PR!