add subcommand summary

[Hexilee]

Print statistics of directories in the tree structure.

> ./juicefs summary -h
NAME:
   juicefs summary - Show tree summary of a directory

USAGE:
   juicefs summary [command options] PATH/INODE

CATEGORY:
   INSPECTOR

DESCRIPTION:
   It is used to show tree summary of target directory.
    
    Examples:
    # Show with path
    $ juicefs summary /mnt/jfs/foo
    
    # Show max depth of 5
    $ juicefs summary --depth 5 /mnt/jfs/foo
   
    # Show top 20 entries
    $ juicefs summary --entries 20 /mnt/jfs/foo
   
    # Show accurate result
    $ juicefs summary --strict /mnt/jfs/foo

OPTIONS:
   --depth value, -d value    depth of tree to show (zero means only show root) (default: 2)
   --entries value, -e value  show top N entries (sort by size) (default: 10)
   --strict                   show accurate summary, including directories and files (may be slow) (default: false)
   --help, -h                 show help (default: false)

Example

> ./juicefs summary ~/mnt/jfs/
/home/hexi/mnt/jfs/: 490959                       135972.5/s   
/home/hexi/mnt/jfs/: 5.9 GiB (6347730944 Bytes)   1.6 GiB/s    
+--------------------+---------+-------+--------+
|        PATH        |   SIZE  |  DIRS |  FILES |
+--------------------+---------+-------+--------+
| .                  | 5.9 GiB | 47203 | 490959 |
| lani               | 2.8 GiB | 23570 | 236454 |
| lani/common        | 2.8 GiB | 23354 | 235378 |
| lani/apps          | 5.5 MiB |   123 |    840 |
| lani/.git          | 3.3 MiB |    16 |     26 |
| lani/docs          | 880 KiB |    17 |     48 |
| lani/tools         | 500 KiB |    23 |     79 |
| lani/libs          | 464 KiB |    27 |     65 |
| lani/.github       |  24 KiB |     1 |      4 |
| lani/rush.json     |  24 KiB |     0 |      1 |
| lani/node_modules  | 8.0 KiB |     0 |      2 |
| lani/.vscode       | 8.0 KiB |     0 |      2 |
| lani/...           |  36 KiB |     0 |      9 |
| lani1              | 2.8 GiB | 23570 | 236454 |
| lani1/common       | 2.8 GiB | 23354 | 235378 |
| lani1/apps         | 5.5 MiB |   123 |    840 |
| lani1/.git         | 3.3 MiB |    16 |     26 |
| lani1/docs         | 880 KiB |    17 |     48 |
| lani1/tools        | 500 KiB |    23 |     79 |
| lani1/libs         | 464 KiB |    27 |     65 |
| lani1/.github      |  24 KiB |     1 |      4 |
| lani1/rush.json    |  24 KiB |     0 |      1 |
| lani1/.vscode      | 8.0 KiB |     0 |      2 |
| lani1/node_modules | 8.0 KiB |     0 |      2 |
| lani1/...          |  36 KiB |     0 |      9 |
| test               | 332 MiB |     0 |  17912 |
| test/file14698.bin |  36 KiB |     0 |      1 |
| test/file6303.bin  |  36 KiB |     0 |      1 |
| test/file14862.bin |  36 KiB |     0 |      1 |
| test/file17670.bin |  36 KiB |     0 |      1 |
| test/file050.bin   |  36 KiB |     0 |      1 |
| test/file099.bin   |  36 KiB |     0 |      1 |
| test/file1943.bin  |  36 KiB |     0 |      1 |
| test/file12992.bin |  36 KiB |     0 |      1 |
| test/file4031.bin  |  36 KiB |     0 |      1 |
| test/file4792.bin  |  36 KiB |     0 |      1 |
| test/...           | 332 MiB |     0 |  17902 |
| roa                | 2.2 MiB |    58 |    139 |
| roa/.git           | 1.4 MiB |    16 |     26 |
| roa/roa            | 248 KiB |     8 |     30 |
| roa/integration    | 144 KiB |    12 |     22 |
| roa/roa-core       | 120 KiB |     3 |     17 |
| roa/roa-async-std  |  32 KiB |     1 |      6 |
| roa/.github        |  28 KiB |     1 |      6 |
| roa/roa-diesel     |  28 KiB |     1 |      5 |
| roa/examples       |  28 KiB |     0 |      7 |
| roa/assets         |  24 KiB |     1 |      5 |
| roa/.vscode        |  20 KiB |     0 |      1 |
| roa/...            |  68 KiB |     1 |     14 |
+--------------------+---------+-------+--------+

[codecov-commenter]

Codecov Report

Patch coverage: 21.51% and project coverage change: +0.18 🎉

Comparison is base (471d836) 56.17% compared to head (4c395df) 56.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3381      +/-   ##
==========================================
+ Coverage   56.17%   56.35%   +0.18%     
==========================================
  Files         147      148       +1     
  Lines       35842    36143     +301     
==========================================
+ Hits        20135    20370     +235     
- Misses      13521    13565      +44     
- Partials     2186     2208      +22     

Impacted Files	Coverage Δ
cmd/clone.go	26.27% <0.00%> (ø)
pkg/meta/interface.go	55.00% <ø> (ø)
pkg/meta/utils.go	51.27% <0.00%> (-17.25%)	⬇️
pkg/vfs/internal.go	49.59% <0.00%> (-1.45%)	⬇️
pkg/sync/sync.go	43.44% <7.14%> (-0.63%)	⬇️
cmd/warmup.go	56.81% <30.00%> (+21.90%)	⬆️
cmd/summary.go	30.46% <30.46%> (ø)
cmd/format.go	57.61% <83.33%> (+0.47%)	⬆️
cmd/info.go	31.25% <100.00%> (+16.40%)	⬆️
cmd/main.go	47.36% <100.00%> (+1.55%)	⬆️
... and 6 more

... and 9 files with indirect coverage changes

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