[Enhancement] Add MerkleRoot type alias for []byte with Sum method

[h5law]

Summary

Human Summary

• Add MerkleRoot []byte alias
• Add Sum(bool) method to the type to get the sum from the trie

AI Summary

Summary generated by Reviewpad on 09 Jan 24 20:24 UTC

This pull request includes changes to the documentation files merkle-sum-trie.md and smt.md, as well as the test file root_test.go, the code file smst.go, and the types file types.go.

The changes to the documentation files add a new section called "Roots" that explains the root of the tree and provides helper functions for interacting with the root.

The changes to the test file add tests for the MerkleRoot type and the Sum() function.

The changes to the code file add a new method Root() that returns the root hash of the trie as a MerkleRoot type.

The changes to the types file add a new type MerkleRoot that is a byte slice representing the root hash, and a Sum() method for computing the sum of the root hash.

Issue

N/A

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

[Olshansk]

Optional suggestion. Approving to get things going.

[Olshansk]

I think this was accidentally deleted