feat: add Encode/Decode<19> for Value type

[AviAvni]

Summary

Split from #359.

• Implement Encode<19> for Value — serialize all property value types to RDB v19 binary format
• Implement Decode<19> for Value — deserialize from RDB v19 binary format
• Supports: Bool, Int, Float, String (including interned), List, Point, VecF32, Datetime, Date, Time, Duration, Null

Test plan

• cargo check passes
• Used by encoder/decoder in subsequent PRs

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: eeb7bf98-67d3-45d6-99e1-b558f3f270bc

📥 Commits

Reviewing files that changed from the base of the PR and between d51f96e and 1a368bb.

📒 Files selected for processing (1)

• graph/src/runtime/value.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 113 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.83%. Comparing base (d51f96e) to head (1a368bb).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
graph/src/runtime/value.rs	0.00%	113 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #375      +/-   ##
==========================================
- Coverage   84.15%   83.83%   -0.33%     
==========================================
  Files         110      110              
  Lines       28963    29076     +113     
==========================================
+ Hits        24375    24377       +2     
- Misses       4588     4699     +111     

Flag	Coverage Δ
fuzz	41.72% <0.00%> (-0.16%)	⬇️

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