feat: support annotating chombos with MERS weight

[Iipin]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 85.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.57%. Comparing base (442d77d) to head (6a49bae).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
chombot-kcc/src/chombot.rs	0.00%	8 Missing ⚠️
chombot-kcc/src/kcc3/data_types.rs	90.66%	7 Missing ⚠️
chombot-kcc/src/slash_commands/chombo.rs	91.89%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #295      +/-   ##
==========================================
+ Coverage   43.27%   48.57%   +5.30%     
==========================================
  Files          21       21              
  Lines        1368     1478     +110     
==========================================
+ Hits          592      718     +126     
+ Misses        776      760      -16     

Flag	Coverage Δ
rust	48.57% <85.00%> (+5.30%)	⬆️

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[seqre]

LGTM!