Add nav status and start commands

[dvorak0]

Summary

• add tinynav nav status based on the navigation tmux session and required ROS nodes
• add tinynav nav start --map-name ... to launch perception, planning, control, and map nodes in tmux
• pass the selected map path into map_node.py from the CLI

Test

• python3 -m py_compile src/tinynav_cli/cli.py