feat: graph encode/decode + iterator attr access

[AviAvni]

Summary

• Add encode_with_range() and Decode<19> to AttributeStore for RDB serialization
• Add encode_payload() to Graph for chunked RDB encoding of nodes, edges, matrices
• Improve capacity growth in create_nodes/create_relationships for effects replay
• Change get_*_all_attrs_by_id to return impl Iterator (avoids Arc clone)
• Adapt reply.rs to work with iterator return type

Part of splitting #359 into smaller reviewable PRs.

Test plan

• cargo test -p graph passes
• pytest tests/test_e2e.py -vv passes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2cc2cd8b-406a-46f0-9e29-507d474b776c

📥 Commits

Reviewing files that changed from the base of the PR and between 6c1e146 and b1a0f25.

📒 Files selected for processing (3)

• graph/src/graph/attribute_store.rs
• graph/src/graph/graph.rs
• src/reply.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch graph-encode-decode

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[codecov]

Codecov Report

❌ Patch coverage is 13.73802% with 270 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.50%. Comparing base (6c1e146) to head (b1a0f25).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
graph/src/graph/graph.rs	12.93%	202 Missing ⚠️
graph/src/graph/attribute_store.rs	11.68%	68 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #381      +/-   ##
==========================================
- Coverage   83.04%   82.50%   -0.54%     
==========================================
  Files         110      110              
  Lines       29400    29621     +221     
==========================================
+ Hits        24414    24439      +25     
- Misses       4986     5182     +196     

Flag	Coverage Δ
fuzz	40.85% <5.82%> (-0.62%)	⬇️

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