Add CLI management for global projects

[DylanDevelops]

The feature request

Users can currently initialize global projects via tmpo init --global, but there is no CLI interface to list, edit, or delete them. Users are forced to hand-edit the projects.yaml file.

Proposed solution

Add a tmpo project command group:

• tmpo project list: Displays all global projects.
• tmpo project edit <name>: Interactive prompt to modify rates or descriptions.
• tmpo project delete <name>: Removes the project from the registry.

Additional context

No response