[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
• [x] Bug fix
• [ ] Code health or cleanup
• [ ] Documentation
• [ ] Other (specify)

Testing

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

Required Checklist

• [x] I have tested my changes using the available tooling
• [x] 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 :warning:
trie_spec.go	33.33%	3 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ 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 ```

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