add rebalance command to move local parts to other disks,

[Slach]

fix #1024

[coveralls]

Coverage Report for CI Build 29506523752

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage decreased (-0.004%) to 68.305%

Details

• Coverage decreased (-0.004%) from the base build.
• Patch coverage: 142 uncovered changes across 3 files (352 of 494 lines covered, 71.26%).
• 24 coverage regressions across 5 files.

Uncovered Changes

File	Changed	Covered	%
pkg/backup/rebalance.go	424	303	71.46%
pkg/server/server.go	62	44	70.97%
cmd/clickhouse-backup/main.go	7	4	57.14%
Total (4 files)	494	352	71.26%

Coverage Regressions

24 previously-covered lines in 5 files lost coverage.

File	Lines Losing Coverage	Coverage
pkg/storage/gcs.go	17	55.32%
pkg/clickhouse/clickhouse.go	2	79.04%
pkg/status/status.go	2	87.84%
pkg/storage/structs.go	2	84.0%
pkg/metadata/backup_metadata.go	1	75.0%

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Coverage Stats

Relevant Lines:	24439
Covered Lines:	16693
Line Coverage:	68.3%
Coverage Strength:	42688.95 hits per line

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💛 - Coveralls