refactor(fracmanager): reorganize package metrics

[eguguchkin]

Fixes #243

---

• I have read and followed all requirements in CONTRIBUTING.md;
• I used LLM/AI assistance to make this pull request;

[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.83%. Comparing base (990f82d) to head (aaf5010).

Files with missing lines	Patch %	Lines
fracmanager/fracmanager.go	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #244      +/-   ##
==========================================
- Coverage   71.88%   71.83%   -0.06%     
==========================================
  Files         199      199              
  Lines       14570    14570              
==========================================
- Hits        10474    10466       -8     
- Misses       3362     3369       +7     
- Partials      734      735       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.