feat(cli): add cluster metadata command

[seokjin0414]

Closes #2634

Summary

• Add iggy cluster metadata CLI command (alias: iggy cl m)
• Table/List output modes with node name, IP, ports, role, status
• Add ClusterClient bound to Client trait

Tests

• 5 integration tests (table mode, list mode, --help, -h, cluster --help)
• help/overview test expectations updated

[codecov]

Codecov Report

❌ Patch coverage is 82.92683% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.67%. Comparing base (29a27cc) to head (d591931).

Files with missing lines	Patch %	Lines
...col/src/cli/binary_cluster/get_cluster_metadata.rs	77.41%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2839      +/-   ##
============================================
- Coverage     67.69%   67.67%   -0.02%     
  Complexity      739      739              
============================================
  Files          1031     1032       +1     
  Lines         83912    83953      +41     
  Branches      60706    60754      +48     
============================================
+ Hits          56802    56819      +17     
- Misses        24760    24773      +13     
- Partials       2350     2361      +11     

Flag	Coverage Δ
csharp	67.06% <ø> (-0.19%)	⬇️
go	6.84% <ø> (ø)
java	54.83% <ø> (ø)
node	92.18% <ø> (-0.23%)	⬇️
python	0.00% <ø> (ø)
rust	69.70% <82.92%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
core/cli/src/args/common.rs	97.87% <100.00%> (+0.25%)	⬆️
core/cli/src/args/mod.rs	78.57% <ø> (ø)
core/cli/src/main.rs	92.07% <100.00%> (+0.15%)	⬆️
...col/src/cli/binary_cluster/get_cluster_metadata.rs	77.41% <77.41%> (ø)

... and 17 files with indirect coverage changes

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