feat/compactor

[Phoenix500526]

Read #188 for more details.

Please briefly answer these questions:

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)

• what changes does this pull request make?

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)

[codecov]

Codecov Report

Patch coverage: 81.02% and project coverage change: +2.06% 🎉

Comparison is base (084b84d) 51.36% compared to head (3f8cedb) 53.42%.

❗ Current head 3f8cedb differs from pull request most recent head 44d8fc4. Consider uploading reports for the commit 44d8fc4 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
+ Coverage   51.36%   53.42%   +2.06%     
==========================================
  Files          95       96       +1     
  Lines       14069    14847     +778     
  Branches    14069    14847     +778     
==========================================
+ Hits         7226     7932     +706     
- Misses       6376     6420      +44     
- Partials      467      495      +28     

Files Changed	Coverage Δ
xline-test-utils/src/lib.rs	1.02% <0.00%> (-0.02%)	⬇️
xline/src/server/xline_server.rs	0.00% <0.00%> (ø)
xline/src/storage/revision.rs	97.05% <ø> (ø)
xline/src/storage/kv_store.rs	71.01% <64.35%> (+6.30%)	⬆️
xline/src/storage/compact/mod.rs	70.83% <70.83%> (ø)
utils/src/config.rs	83.92% <74.28%> (-0.87%)	⬇️
xlineapi/src/lib.rs	59.47% <83.33%> (+2.32%)	⬆️
xline/src/server/kv_server.rs	51.34% <84.44%> (+14.30%)	⬆️
xline/src/server/watch_server.rs	79.53% <84.94%> (+0.39%)	⬆️
xline/src/server/command.rs	73.30% <96.58%> (+6.56%)	⬆️
... and 3 more

... and 3 files with indirect coverage changes

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