Add DB compaction after the deletion of a DB prefix

[michaelsutton]

Apparently LevelDB does not necessarily compact data following a large delete operation, but rather marks items as deleted, which at times might increase DB size until a compaction is triggered.

Since DB size effects performance even if disk has sufficient space, it makes sense to explicitly call Compact whenever we delete a whole DB prefix.

Specifically, this will help nodes using migrate to reduce DB size following the migration.

[codecov]

Codecov Report

Merging #2003 (f64771d) into dev (ab73def) will decrease coverage by 0.07%.
The diff coverage is 81.81%.

❗ Current head f64771d differs from pull request most recent head 46e7759. Consider uploading reports for the commit 46e7759 to get more accurate results

@@            Coverage Diff             @@
##              dev    #2003      +/-   ##
==========================================
- Coverage   59.70%   59.63%   -0.08%     
==========================================
  Files         663      663              
  Lines       31514    31521       +7     
==========================================
- Hits        18817    18798      -19     
- Misses      10028    10047      +19     
- Partials     2669     2676       +7     

Impacted Files	Coverage Δ
...nsensus/processes/pruningmanager/pruningmanager.go	53.47% <ø> (ø)
domain/prefixmanager/prefix.go	60.71% <75.00%> (-0.83%)	⬇️
infrastructure/db/database/ldb/leveldb.go	66.66% <100.00%> (+2.38%)	⬆️
app/appmessage/error.go	0.00% <0.00%> (-27.28%)	⬇️
...etadapter/server/grpcserver/protowire/rpc_error.go	75.00% <0.00%> (-25.00%)	⬇️
app/rpc/rpchandlers/get_mempool_entry.go	41.17% <0.00%> (-23.53%)	⬇️
infrastructure/network/rpcclient/rpc_get_info.go	45.45% <0.00%> (-18.19%)	⬇️
...ructure/network/rpcclient/rpc_get_mempool_entry.go	45.45% <0.00%> (-18.19%)	⬇️
app/protocol/flows/v5/blockrelay/block_locator.go	52.94% <0.00%> (-11.77%)	⬇️
...ain/consensus/database/binaryserialization/hash.go	69.56% <0.00%> (-8.70%)	⬇️
... and 6 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ab73def...46e7759. Read the comment docs.