feat: attribute import, temporal properties, SET fix

[AviAvni]

Summary

• Add import_attrs() to AttributeStore for bulk importing entity attributes (used by RDB decoder)
• Add import_node_attrs() / import_relationship_attrs() to Graph
• Allow temporal types (Datetime, Date, Time, Duration) in is_valid_property validation
• Fix SET on relationships that exist in pending state

Context

Part of splitting #359 (RDB serialization) into smaller reviewable PRs. This PR extracts attribute import helpers and two bug fixes that are independent of the larger serialization changes.

Test plan

• cargo test -p graph passes
• Existing e2e tests pass (pytest tests/test_e2e.py -vv)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4e016066-857e-4c97-983f-5698744e71cc

📥 Commits

Reviewing files that changed from the base of the PR and between 2aef6e3 and 272f8a9.

📒 Files selected for processing (4)

• graph/src/graph/attribute_store.rs
• graph/src/graph/graph.rs
• graph/src/runtime/ops/set.rs
• graph/src/runtime/pending.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pending-attrs-split

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[codecov]

Codecov Report

❌ Patch coverage is 5.88235% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.02%. Comparing base (2aef6e3) to head (272f8a9).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
graph/src/graph/attribute_store.rs	0.00%	19 Missing ⚠️
graph/src/graph/graph.rs	0.00%	12 Missing ⚠️
graph/src/runtime/ops/set.rs	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   83.16%   83.02%   -0.14%     
==========================================
  Files         109      110       +1     
  Lines       29327    29400      +73     
==========================================
+ Hits        24389    24410      +21     
- Misses       4938     4990      +52     

Flag	Coverage Δ
fuzz	41.31% <2.94%> (?)

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