Move purger API endpoint to another component

[wilfriedroset]

Is your feature request related to a problem? Please describe.

The component "purger" is only responsible for exposing 2 API endpoints. When called mimir will upload a marker in the bucket which will ultimately trigger the purge of the data. Apart from this the purger does nothing else.

Describe the solution you'd like

Migrate the purger to another component, the compactor for example.

Describe alternatives you've considered

To achieve the same behavior we could enable the module along with another one

target: compactor,purger

Additional context

In a not monolithic deployment this help save resource (pod or instance)
General idea come from slack channel: https://grafana.slack.com/archives/C039863E8P7/p1655914578345719

[pracucci]

I agree compactor is a good component to host the purger API.