Refactor launcher and add watchdog integration

[bruno-f-cruz]

This PR:

• Simplifies the Launcher class structure and cleans up some of the code base to adhere to better logging, static typing and method access standards
  • Attempts to generalize the "hook"-like logic to run scripts by now exposing a pre, during and post-running hook.
• Refactors the aind-mapper module to further automate the creation of a session.json artifact
• Exposes an entry point to aind-watchdog-service that can be used to automatically upload data at the end of the session