Toolkits for filesystem, bash, and notebook

[3coins]

This PR adds three new toolkits to the jupyter-ai-tools repository, enabling AI agents to interact with file systems,
manipulate notebooks, and execute code:

1. File System Toolkit: Enables agents to interact with the file system

from jupyter_ai_tools.toolkits.file_system import toolkit as fs_toolkit

# In agent creation:
tools = [tool.callable for tool in fs_toolkit.get_tools()]

# Agent can now use these capabilities:
agent.invoke("Find all Python files in the project")
# Agent will use tools like glob("**/*.py"), read(), grep() etc.

2. Notebook Toolkit: Allows agents to manipulate Jupyter notebooks (currently untested)

from jupyter_ai_tools.toolkits.notebook import toolkit as nb_toolkit

# In agent creation:
tools = [tool.callable for tool in nb_toolkit.get_tools()]

# Agent can now analyze and modify notebooks
agent.invoke("Summarize the notebook and add a markdown cell with explanations")

Note: Notebook toolkit functionality is currently untested and will be refined after this PR is merged.

3. Code Execution Toolkit: Enables agents to execute bash commands

from jupyter_ai_tools.toolkits.code_execution import toolkit as exec_toolkit

# In agent creation:
tools = [tool.callable for tool in exec_toolkit.get_tools()]

# Agent can now run bash commands as part of its reasoning
agent.invoke("Install missing dependencies for this project")
# Agent will use bash() to check and install packages

[Zsailer]

Looks good to me, @3coins!

[Zsailer]

@3coins I cut a release of jupyter_server_ai_tools and pushed a commit to your branch using this latest release to fix the failing CI.

[Zsailer]

Nice work @3coins! Merging and working on a release next!