[Enhancement] Module CLI

[kichanyurd]

Motivation

Currently, to work with modules, you need to manually create a module file from scratch and manually pass it to the server every time using the --module parameter. It'd be nice to have some assistance and ergonomics around this.

Solution Proposal

1. Move parlant.toml to under PARLANT_HOME
2. Add a CLI groupmodule
3. Add a command parlant-server module init NAME to initialize a new module. This command should create the file and output its created location at $PARLANT_HOME/NAME.py
   1. Support template parameters. For example, --tool-service should create the module using a tool service template.
   2. In the future, we will have templates life lifecycle hooks, registering custom NLP models, etc..
4. Add a command parlant-server module enable NAME that adds it to parlant.toml so that it's automatically loaded each time even when not specified in the CLI when starting the server
5. Add a command parlant-server module disable NAME that removes it from parlant.toml# Discussion
   Add any other context or open questions about the feature request here.