feat(dursto): Add structs for lazy-loading of Merkle Layer

[NSant215]

Part of RV-892.

What

• enables AVL nodes to be loaded on-demand from a persistence-layer.
• Added LazyNodeId and LazyResolver types to support lazy loading and caching of AVL nodes from a key-value store, including implementation of Resolver for LazyNodeId and methods for resolving nodes and hashes on demand.
• Implemented serialization and deserialization for AVL tree root representations using NodeHashRepresentation, including methods for serializing the root and constructing a tree from serialized data.
• Added Decode and BorrowDecode implementations for Bytes<Normal> to support owned and borrowed deserialization, and derived Decode for BytesTemplate.

Why

• necessary steps for adding checkout capability for durable storage.

Manually Testing

make all

Tasks for the Author

• Link all Linear issues related to this MR using magic words (e.g. part of, relates to, closes).
• Eliminate dead code and other spurious artefacts introduced in your changes.
• Document new public functions, methods and types.
• Make sure the documentation for updated functions, methods, and types is correct.
• Add tests for bugs that have been fixed.
• Explain changes to regression test captures when applicable.
• Write commit messages in agreement with our guidelines.
• Self-review your changes to ensure they are high-quality.
• Complete all of the above before assigning this MR to reviewers.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.89%. Comparing base (2269509) to head (641f777).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
data/src/components/bytes.rs	0.00%	10 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #868      +/-   ##
==========================================
- Coverage   90.96%   90.89%   -0.08%     
==========================================
  Files         112      112              
  Lines       21493    21503      +10     
  Branches    21493    21503      +10     
==========================================
- Hits        19552    19545       -7     
- Misses       1561     1578      +17     
  Partials      380      380              

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[github-actions]

Benchmark results for revision ed4d828:

Metric	Duration	TPS
Mean	1.530089979s	26.143
Worst	1.538756439s	25.995
Best	1.516288565s	26.380
Standard Deviation	±5.942137ms	±0.102

Full results

Run	Transfers	Duration	TPS
1	40	1.537627345s	26.014
2	40	1.530647873s	26.133
3	40	1.538756439s	25.995
4	40	1.529561545s	26.151
5	40	1.532902881s	26.094
6	40	1.533415139s	26.086
7	40	1.525628159s	26.219
8	40	1.535356531s	26.053
9	40	1.521583161s	26.288
10	40	1.529014584s	26.161
11	40	1.538088698s	26.006
12	40	1.530801283s	26.130
13	40	1.518475714s	26.342
14	40	1.535172151s	26.056
15	40	1.528757161s	26.165
16	40	1.529167619s	26.158
17	40	1.52778618s	26.182
18	40	1.533196023s	26.089
19	40	1.529572528s	26.151
20	40	1.516288565s	26.380

Compare the results above with those for the default branch.