Show time spent per block in benchmark

[cody-littley]

Describe your changes and provide context

Adds a new visualization that shows time spent per block doing various operations. This is amortized time, since we don't, for example, commit after every block.

Testing performed to validate your change

Local testing.

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Mar 4, 2026, 6:45 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.39%. Comparing base (e45e0b9) to head (086caeb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3019      +/-   ##
==========================================
- Coverage   58.40%   58.39%   -0.02%     
==========================================
  Files        2110     2109       -1     
  Lines      175009   174941      -68     
==========================================
- Hits       102220   102155      -65     
+ Misses      63761    63755       -6     
- Partials     9028     9031       +3     

Flag	Coverage Δ
sei-db	70.62% <ø> (+0.21%)	⬆️

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see 32 files with indirect coverage changes

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