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use grpc for communicating with compactor for query time filtering of data requested for deletion (#7804)
Manual backport of #7804 and #7814
What this PR does / why we need it:
Add grpc support to compactor for getting delete requests and gen number for query time filtering.
Since these requests are internal to Loki, it would be good to use grpc instead of HTTP same as all the internal requests we do in Loki.
I have added a new config for accepting the grpc address of the compactor. I tried having just the existing config and detecting if it is a grpc server, but it was hard to do it reliably, considering the different deployment modes we support. I think it is safe to keep it the same and eventually deprecate the existing config.
Checklist
CHANGELOG.md
updated(cherry picked from commit 1410808)