Support partial installations with optional dependencies

[JaimeCernuda]

Add support for installing only specific MCP servers using optional dependencies:

uv pip install iowarp-agent-toolkit[hdf5,adios,parquet]

This would install only the selected servers and their dependencies instead of all 15 servers.

Then run with:

uvx iowarp-agent-toolkit mcp-server hdf5

Benefits:

• Smaller installation footprint
• Faster install times
• Only install what you need

Implementation:
Add [project.optional-dependencies] to root pyproject.toml with each MCP server as an extra.

[JaimeCernuda]

Priority: Low