Support chart queries for on-demand metrics

[jan-auer]

Add chart based on extrapolation on events data in:

• alert creation/editing
• view existing alert
• dashboard widgets creation/editing
• view exiting widgets

Tasks

Beta Give feedback

1. feat(alerts): on demand metric timeseries support #53053
   Scope: Backend +1
   
2. feat(alerts): on demand metric alert chart #52962
   Scope: Frontend +1
   
3. fix(alerts): resolve granularity from snuba query #53426
   Scope: Backend +1
   
4. feat(dynamic-sampling): expose project sample rate #53435
   Scope: Backend +1
   
5. feat(alerts): use extrapolated data during creation #53428
   Scope: Frontend +1