Document all entry points somewhere

[DylanRussell]

We should publicly document which entry_points we load stuff from -- what their names are and what types of things we expect the entry_point to load in.

[sginji]

Hi! I am interested in working on this issue - can I pick this up? Would you consider this to be a good first issue?

[DylanRussell]

Yeah I think so.. some of the entry points are documented in random places ( search entry points in this repo to see what I mean) but I don't see them all enumerated in one place, which would be helpful

[sginji]

thank you!! can you assign this to me? i will work on this

[DylanRussell]

I think only maintainers / approvers can do that

[sginji]

I think only maintainers / approvers can do that

#4701 - let me know if this makes sense!