feat(grafana): use Python script to generate dashboard

[skyzh]

Signed-off-by: Alex Chi iskyzh@gmail.com

What's changed and what's your intention?

As title. No more JSON conflicts!

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

close #2953

[codecov]

Codecov Report

Merging #2979 (d3741a9) into main (60203cd) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2979      +/-   ##
==========================================
- Coverage   72.87%   72.86%   -0.01%     
==========================================
  Files         722      722              
  Lines       96610    96610              
==========================================
- Hits        70401    70398       -3     
- Misses      26209    26212       +3     

Flag	Coverage Δ
rust	72.86% <ø> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
src/meta/src/model/barrier.rs	78.57% <0.00%> (-3.58%)	⬇️
src/meta/src/hummock/mock_hummock_meta_client.rs	50.00% <0.00%> (-1.29%)	⬇️
src/storage/src/hummock/local_version_manager.rs	90.06% <0.00%> (-0.16%)	⬇️

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