cmd/compact: add new compact cmd, used for specific path (#4303)

[jiefenghuang]

Support triggering compaction of all files under a given directory #4303

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Attention: 128 lines in your changes are missing coverage. Please review.

Comparison is base (62d9a84) 55.82% compared to head (48a0195) 41.02%.

Files	Patch %	Lines
cmd/compact_unix.go	80.00%	22 Missing and 8 partials ⚠️
pkg/meta/redis_lock.go	22.72%	17 Missing ⚠️
pkg/meta/utils.go	68.00%	12 Missing and 4 partials ⚠️
pkg/meta/redis.go	58.33%	14 Missing and 1 partial ⚠️
pkg/meta/tkv.go	0.00%	14 Missing ⚠️
pkg/meta/sql.go	0.00%	12 Missing ⚠️
pkg/meta/base.go	82.92%	5 Missing and 2 partials ⚠️
pkg/utils/file.go	40.00%	4 Missing and 2 partials ⚠️
cmd/gc.go	61.53%	3 Missing and 2 partials ⚠️
pkg/meta/sql_lock.go	0.00%	3 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4330       +/-   ##
===========================================
- Coverage   55.82%   41.02%   -14.81%     
===========================================
  Files         153      154        +1     
  Lines       39733    39915      +182     
===========================================
- Hits        22181    16375     -5806     
- Misses      15059    21695     +6636     
+ Partials     2493     1845      -648     

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