Auto populate IDOM component registry

[Archmonger]

When Django first loads, attempt to populate the IDOM component registry.

This design was inspired by django_compressor. See https://github.com/idom-team/django-idom/discussions/20 for more details.

[Archmonger]

The only caveat to this design is it seems to inconsistently break django-silk.
Currently digging into root cause on that.

[Archmonger]

Converting to draft while I debug django-silk compatibility

[Archmonger]

It was too much of a hassle to PR a fix for django-silk falling apart due to non-HTTP request renders (silk's source is messy), so I opted to rely on regex to parse component names.

This implementation should be functionally equivalent.

[Archmonger]

I resolved the two comments, and additionally I've created a tests folder since we'll likely add more in the future.

Django mandates this test folder naming scheme, but it does feel a bit awkward though since our test project is also called tests. Might be something worth changing in a future PR.

[rmorshea]

LGTM besides a few more minor nits

[rmorshea]

Once we get this in I think we can do a release if the threading issue is gonna take a while to resolve.

[Archmonger]

Completed!