Implement rule evaluation using read-path components rather than embedded querier

[dannykopping]

Is your feature request related to a problem? Please describe. Currently, the ruler component uses an embedded querier for its rule evaluations.

Describe the solution you'd like Mimir has implemented "remote rule evaluation" in 2.1.0: https://github.com/grafana/mimir/releases/tag/mimir-2.1.0

Remote ruler mode for improved rule evaluation performance: We've added a remote mode for the Grafana Mimir ruler, in which the ruler delegates rule evaluation to the query-frontend rather than evaluating rules directly within the ruler process itself. This allows recording and alerting rules to benefit from the query parallelization techniques implemented in the query-frontend (like query sharding). Remote mode is considered experimental and is off by default. To enable, see remote ruler.

Describe alternatives you've considered N/A

Additional context N/A

[liguozhong]

👍 This is great. It is very dangerous that the ruler cannot perform concurrency control and current limiting through the querier-scheduler.

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