Add notebook cell metadata editing capabilities to NotebookEdit tool

Feature Request: Notebook Cell Metadata Editing

### Problem
Currently, the NotebookEdit tool can only modify cell content but not cell metadata (like tags, execution_count, etc.). This limits the ability to:

• Tag cells as "parameters" for Papermill integration
• Modify cell metadata for notebook organization
• Set up automated notebook workflows

### Proposed Solution
Extend the NotebookEdit tool with optional metadata parameters:

• metadata: Object to set/update cell metadata
• add_tags: Array of tags to add to cell
• remove_tags: Array of tags to remove from cell

### Example Usage
```python
NotebookEdit(
notebook_path="/path/to/notebook.ipynb",
cell_id="abc123",
add_tags=["parameters"],
metadata={"custom_field": "value"}
)

Use Case

Working with parameterized notebooks where cells need proper tagging for tools like Papermill.