feat(SPV-1545): migrate merkle roots endpoint to v2

[jakubmkowalski]

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.

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Manual Tests

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Codecov Report

Attention: Patch coverage is 0% with 162 lines in your changes missing coverage. Please review.

Project coverage is 35.17%. Comparing base (f0f28b3) to head (8ed0069).

Files with missing lines	Patch %	Lines
api/gen.models.go	0.00%	118 Missing ⚠️
api/gen.api.go	0.00%	28 Missing ⚠️
actions/v2/merkleroots/merkleroots.go	0.00%	8 Missing ⚠️
actions/v2/merkleroots/server.go	0.00%	7 Missing ⚠️
actions/v2/api.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #941      +/-   ##
==========================================
- Coverage   35.45%   35.17%   -0.29%     
==========================================
  Files         425      427       +2     
  Lines       20060    20222     +162     
==========================================
  Hits         7113     7113              
- Misses      12355    12517     +162     
  Partials      592      592              

Flag	Coverage Δ
unittests	35.17% <0.00%> (-0.29%)	⬇️

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

Files with missing lines	Coverage Δ
actions/v2/api.go	0.00% <0.00%> (ø)
actions/v2/merkleroots/server.go	0.00% <0.00%> (ø)
actions/v2/merkleroots/merkleroots.go	0.00% <0.00%> (ø)
api/gen.api.go	0.00% <0.00%> (ø)
api/gen.models.go	0.00% <0.00%> (ø)

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