feat(BUX-294): Replacing CMPSlice with BUMPPaths in DraftTransaction

[kuba-4chain]

Pull Request Checklist

• 📖 I created my PR using provided : CODE_STANDARDS
• 📖 I have read the short Code of Conduct: CODE_OF_CONDUCT
• 🏠 I tested my changes locally.
• ✅ I have provided tests for my changes.
• 📝 I have used conventional commits.
• 📗 I have updated any related documentation.
• 💾 PR was issued based on the Github or Jira issue.

[mergify]

Welcome to our open-source project @kuba-4chain! 💘

[codecov]

Codecov Report

Merging #448 (981edef) into master (b6d63ae) will decrease coverage by 0.88%.
Report is 3 commits behind head on master.
The diff coverage is 80.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #448      +/-   ##
==========================================
- Coverage   52.55%   51.67%   -0.88%     
==========================================
  Files         102      102              
  Lines       10827    10963     +136     
==========================================
- Hits         5690     5665      -25     
- Misses       4690     4864     +174     
+ Partials      447      434      -13     

Flag	Coverage Δ
unittests	51.67% <80.59%> (-0.88%)	⬇️

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

Files	Coverage Δ
model_compound_merkle_path.go	64.51% <ø> (-9.17%)	⬇️
model_merkle_proof.go	78.26% <100.00%> (-4.84%)	⬇️
model_draft_transactions.go	71.32% <11.11%> (-1.49%)	⬇️
model_bump.go	67.79% <80.85%> (+51.12%)	⬆️

... and 3 files with indirect coverage changes

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