WIP Tool packages

[tcdent]

Idea here is that all of the tool-specific implementation (including config JSON) lives in one directory.

Dependencies move from the JSON file into a pyproject.toml file, which also breaks out any framework-specific dependencies, like the version of CrewAI it uses, into a tag under optional-dependencies.

We still need to discuss a preferred package manager so I dove into to the docs of the top four and put together some possible commands. uv and pip do what we need out of the box. poetry can still help us with dependencies, but copying the actual source files rolls back to a manual copy. conda would be similar to pip, since we'd probably just fall back to pip in that case; it doesn't have any CLI flags for this kind of conditional copying nor does it really support pyproject.toml.

agent_connect is the only tool dir that I reorganized so far to reflect this new structure.

Would be cool to explicitly specify a preferred package manager in agentstack.json if we do go with multiple managers.

Needs tests before merge as well.

This addresses #43

[bboynton97]

lets save this for 0.3 because it will require the project upgrade script. we can merge it now though and create a 0.2 branch for bug fixes and small features