Add more metrics for compaction and sealed replicas and enable compaction after bootstrap

[justinlin-linkedin]

Summary

When a replica starts bootstrapping on a host, we disable compaction for this replica. This makes sense since bootstrap process employs the regular replication protocol, which would ignore expired and deleted blob. There are not many blobs to compact. However, after bootstrap finishes, this replica would start serving client requests, more blobs will be deleted and expired. We should enable compaction after bootstrap.

This PR fixed this issue by adding logic to enable compaction in storage manager.

This PR also exposes two more metrics

1. showing how many replicas are disabled for compaction on each host
2. showing how many replicas are sealed on each host.

Testing Done

Wait for unit test

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 46.29630% with 29 lines in your changes missing coverage. Please review.

Project coverage is 69.93%. Comparing base (52ba813) to head (b05c094).
Report is 179 commits behind head on master.

Files with missing lines	Patch %	Lines
...in/java/com/github/ambry/store/StorageManager.java	23.80%	11 Missing and 5 partials ⚠️
...m/github/ambry/clustermap/HelixClusterManager.java	0.00%	9 Missing ⚠️
.../main/java/com/github/ambry/store/DiskManager.java	66.66%	1 Missing and 1 partial ⚠️
...java/com/github/ambry/store/CompactionManager.java	50.00%	0 Missing and 1 partial ⚠️
.../com/github/ambry/store/StorageManagerMetrics.java	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3006      +/-   ##
============================================
+ Coverage     64.24%   69.93%   +5.68%     
- Complexity    10398    12159    +1761     
============================================
  Files           840      889      +49     
  Lines         71755    75202    +3447     
  Branches       8611     9000     +389     
============================================
+ Hits          46099    52590    +6491     
+ Misses        23004    19859    -3145     
- Partials       2652     2753     +101     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Arun-LinkedIn]

lgtm!