feat: full inspect

[vagetablechicken]

1. inspect for full cluster report
2. only make rpc hint to be optional(need extra lib pb and bs4), we can call rpc in base version
3. docs about full inspect
4. docs about diag tool commands and add inspect in must read

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3bb9df7) 75.31% compared to head (95980fb) 75.31%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3559      +/-   ##
============================================
- Coverage     75.31%   75.31%   -0.01%     
  Complexity      587      587              
============================================
  Files           718      719       +1     
  Lines        129780   129824      +44     
  Branches       1280     1280              
============================================
+ Hits          97741    97771      +30     
- Misses        31753    31767      +14     
  Partials        286      286              

Files	Coverage Δ
python/openmldb_tool/tests/inspect_test.py	100.00% <100.00%> (ø)

... and 26 files with indirect coverage changes

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