feat(uptime): Add api for creating new uptime monitors

[wedamija]

This api is currently gated behind a feature flag, so that we can just allow this on orgs we want to test on. We shouldn't enable this on other orgs until we have billing related concerns sorted out.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.52459% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.24%. Comparing base (ccbdb39) to head (e82ba27). Report is 30 commits behind head on master.

:white_check_mark: All tests successful. No failed tests found.

Files	Patch %	Lines
src/sentry/uptime/endpoints/validators.py	81.81%	3 Missing and 1 partial :warning:
src/sentry/uptime/subscriptions/subscriptions.py	66.66%	1 Missing and 2 partials :warning:

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #75794   +/-   ##
=======================================
  Coverage   78.24%   78.24%           
=======================================
  Files        6818     6819    +1     
  Lines      303690   303749   +59     
  Branches    52236    52247   +11     
=======================================
+ Hits       237612   237664   +52     
- Misses      59687    59693    +6     
- Partials     6391     6392    +1     

Files	Coverage Δ
src/sentry/api/urls.py	100.00% <100.00%> (ø)
src/sentry/features/temporary.py	100.00% <100.00%> (ø)
src/sentry/uptime/detectors/tasks.py	95.04% <100.00%> (-0.05%)	:arrow_down:
...try/uptime/endpoints/project_uptime_alert_index.py	100.00% <100.00%> (ø)
src/sentry/uptime/subscriptions/subscriptions.py	92.50% <66.66%> (-7.50%)	:arrow_down:
src/sentry/uptime/endpoints/validators.py	83.67% <81.81%> (-1.52%)	:arrow_down:

... and 7 files with indirect coverage changes

[sentry[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ KeyError: 'owner' /api/0/projects/{organization_id_or_slug}/{proj... View Issue

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