Feature request: on_project_kill event

Is your feature request related to a problem? Please describe.

Hi! I love tmuxinator, but I have a rather off-spec way of using it. I like creating shebanged executable .tmux.yml files so I can have several launchers for different deployments of the same tools.

I would love an on_kill event the same way a on_project_start exists. I have this global shortcut <prefix>X that is bound to tmux kill-session which I use all the time for both tmuxinator and plain tmux.

There is already an on_project_exit, but it is not enough for me as I usually detach and reattach to sessions. As a side note, a better name for it would be on_project_detach so its intent is clear IMO.

Also on_project_stop does not respond when a session is killed (unless I'm doing something wrong).

Describe the solution you'd like

A YAML-supported on_project_kill entry.

Describe alternatives you've considered

I typically hook this up like this, which is fragile, relies on the session name and hinders readability of on_project_start:

#! /usr/bin/env -S tmuxinator start -p
# chmod +x me!

name: my_session
on_project_start: |
    # Startup tasks
    rm -rf /tmp/out/*

    # Cleanup hook install
    nohup bash -c "
      until tmux has-session -t my_session 2>/dev/null; do sleep 1; done;
      while tmux has-session -t my_session 2>/dev/null; do sleep 2; done;
        docker container kill foo
    " >/dev/null 2>&1 &

windows:
  - main:
      layout: even-horizontal
      panes:
          - docker run -it --name foo bar
          - sleep 5; ./curl
          - watch ls -lh /tmp/out

Additional context Add any other context or screenshots about the feature request here.

Thank you :)