ENH: Add property and entity classes
Adds classes for entities and properties that basically only wrap the corresponding generated proto objects. They implement a few convenience functions already, though.
Test together with f-denote-non-articles
branch of CFAED's complexitywiki (i.e., npm pack
this, npm install path/to/package
in complexity wiki, then start complexitywiki, serverer-profile in local-testing-main
and local envoy). Verify that the entities are queried and retrieved correctly. Also try to create corner cases.