feat(billing): WIP interface

[mrduncan]

Example usage:

from sentry.billing import billing_service
from sentry.billing.config import UsageCategoryId

billing_service.usage_tracking.record_usage(
    org_id,
    UsageCategoryId.ERROR_ACCEPTED,
    {"project_id": project_id, "event_id": event_id, "key_id": dsn},
)

Goal is for src/sentry/billing/config.py to be the only file here that a product team might need to edit.

[codecov]

Codecov Report

❌ Patch coverage is 98.14815% with 1 line in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/sentry/billing/config.py	94.73%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #105079      +/-   ##
===========================================
+ Coverage   78.76%    80.64%   +1.88%     
===========================================
  Files        9408      9424      +16     
  Lines      403500    404448     +948     
  Branches    25631     25631              
===========================================
+ Hits       317804    326180    +8376     
+ Misses      85229     77801    -7428     
  Partials      467       467              

[getsantry]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀