[Misc] Integration fixes after the v0.11.0 release

[Olshansk]

Summary

• Exposing NewTrieSpec publically
• Adding back Sum function to the MerkleRoot type
• Adding a new Count function to the MerkleRoot type
• Adding back PathHasherSize

Human Summary

AI Summary

reviewpad:summary

Issue

Fixing a few integration issues with poktroll after this release: https://github.com/pokt-network/smt/releases/tag/v0.11.0

Type of change

Please mark the relevant option(s):

• New feature, functionality or library
• Bug fix
• Code health or cleanup
• Documentation
• Other (specify)

Testing

• Run all unit tests: make test_all
• Run all/relevant benchmarks (if optimising): make benchmark_{all | suite name}

Required Checklist

• I have tested my changes using the available tooling
• I have performed a self-review of my own code
• I have commented my code (godoc format comments see: tip.golang.org/doc/comment)

If Applicable Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have updated any relevant README(s)/documentation and left TODOs throughout the codebase
• Add or update any relevant or supporting mermaid diagrams

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 20 lines in your changes missing coverage. Please review.

Project coverage is 81.99%. Comparing base (e3dbbbd) to head (650471b).
Report is 12 commits behind head on main.

Files	Patch %	Lines
root.go	0.00%	16 Missing ⚠️
trie_spec.go	33.33%	3 Missing and 1 partial ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   81.31%   81.99%   +0.68%     
==========================================
  Files           9       15       +6     
  Lines        1493     1711     +218     
==========================================
+ Hits         1214     1403     +189     
- Misses        215      244      +29     
  Partials       64       64              

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

[red-0ne]

Couple of NITs but gtg.