feat(relay): Introduce options to global config

[Dav1dde]

Setup infrastructure to add options to the global config, also update the global config endpoint to signal relay the global config is fully ready.

Relay PR: getsentry/relay#2813

[codecov]

Codecov Report

Merging #61024 (41a6c01) into master (bb82f15) will decrease coverage by 1.95%.
Report is 60 commits behind head on master.
The diff coverage is 68.75%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #61024      +/-   ##
==========================================
- Coverage   82.97%   81.02%   -1.95%     
==========================================
  Files        5536     5184     -352     
  Lines      236356   227443    -8913     
  Branches    38182    38200      +18     
==========================================
- Hits       196108   184287   -11821     
+ Misses      39958    37520    -2438     
- Partials      290     5636    +5346     

Files	Coverage Δ
src/sentry/api/endpoints/relay/project_configs.py	95.81% <100.00%> (-1.56%)	⬇️
src/sentry/relay/globalconfig.py	72.22% <66.66%> (-27.78%)	⬇️

... and 1844 files with indirect coverage changes

[iker-barriocanal]

We should test it with relay library and make sure this is the protocol relay expects, like in

sentry/tests/sentry/api/endpoints/test_relay_globalconfig_v3.py

Line 33 in e01d820

def test_global_config():

You may need to make a new librelay release too.

[Dav1dde]

This will be tested the moment we actually add an option we want exposed in Relay. Now this requires monkey patching the global list and the next person adding the first option would actually have to remember to remove the monkey patch again.