Add RPC method for reporting; modify tests; add PNNL branding

[bonicim]

• Addresses #26 #25
• Adds RPC method that will add a new report to the VEN client; this method is a wrapper around OpenLeadr's add_report method. For details on how it works see their documentation
• Adds PNNL branding to all python modules
• Updates tests (NOTE: we can't write tests for this modular agent as of now; I'm adding one test that simply 'passes' so that the workflow won't fail in Github Actions)

UPDATE:

• Added sphinx and docs folder

~* Tested docs on html; screenshot attached:~

[craig8]

It might be worth looking into this for adding typehints with docs so we don't have to document in both locations. Let me know if this is something I should help with or not? @bonicim https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html#confval-autodoc_typehints

[bonicim]

Will add sphinx and run it locally to test.

[bonicim]

It might be worth looking into this for adding typehints with docs so we don't have to document in both locations. Let me know if this is something I should help with or not? @bonicim https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html#confval-autodoc_typehints

I just saw this comment after I made the latest push, which added Sphinx and the docs/ dir. I tested the docs using make html and included a screenshot. Let me know what you think.

[bonicim]

Added autodoc_typehints to the documentation. Screenshot of current docs shown below. Note how custom datatypes are given the full path in the red box marker:

[craig8]

Would you add the rtd theme to the docs. The main volttron requirements for rtd are here. https://github.com/VOLTTRON/volttron/blob/main/docs/requirements.txt