Support LabGraph Monitor using a free online service

[jfResearchEng]

🚀 Feature

Creating instructions on hosting LabGraph Monitor service using a free online service, Reference.

This would help reduce the computer usage for user locally and simplify the use case for LabGraph Monitor.

Additional context

1. Existing application can be found [here] (https://github.com/facebookresearch/labgraph/tree/main/extensions/prototypes/labgraph_monitor)
2. The code should be added at folder is https://github.com/facebookresearch/labgraph/tree/main/extensions/labgraph_monitor
   Note that the application would be moved out of the prototypes folder.
3. Create setup.py and README.md, where example can be found at: https://github.com/facebookresearch/labgraph/tree/main/extensions/labgraph_viz
4. Add github action support, reference: https://github.com/facebookresearch/labgraph/actions/workflows/main.yml