Persist postgres hll buckets in redis

What does this MR do?

This MR adds method to cache hll buckets used to calculate selected usage ping metrics. This caching will allow to calculate aggregated metrics data without need of repeating database queries.

Implements: #299322 (closed)

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry no user facing changes
• [-] Documentation (if required) # aggregated metrics documentation will be update once whole processing of database calculated metrics will be completed.
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