test(dpp): improve coverage for document property serialization and encoding

[QuantumExplorer]

Summary

Adds 87 tests to the document property type module — the largest non-excluded file in rs-dpp (4647 lines).

Area	Tests	What's covered
encode/read round-trips	30	All integer types (required + optional paths), F64, Date, String, ByteArray
Object serialization	5	Nested fields, required/optional inner fields, missing required error
Tree key encode/decode	20	All types, boundary values (MIN/MAX), empty string sentinel
read_optionally_from	12	Optional markers, fixed-size ByteArray (20/32/36), variable ByteArray
min/max byte size	5	Object field summing, VariableTypeArray, Identifier
Marker verification	15	Non-required encoding prefix (0xFF) for all integer types

Test plan

• cargo test -p dpp --lib -- property::tests passes (275 total)
• cargo fmt --all clean
• CI

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 50d03b1d-7162-488e-a27b-07588d4c8d70

📥 Commits

Reviewing files that changed from the base of the PR and between 8a83981 and 9a6ca1b.

📒 Files selected for processing (1)

• packages/rs-dpp/src/data_contract/document_type/property/mod.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/dpp-property-serialization

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[thepastaclaw]

⏳ Review in progress (commit 9a6ca1b)

[codecov]

Codecov Report

❌ Patch coverage is 98.18689% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.72%. Comparing base (8a83981) to head (9a6ca1b).
⚠️ Report is 2 commits behind head on v3.1-dev.

Files with missing lines	Patch %	Lines
...pp/src/data_contract/document_type/property/mod.rs	98.18%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           v3.1-dev    #3439      +/-   ##
============================================
+ Coverage     80.66%   80.72%   +0.06%     
============================================
  Files          2852     2852              
  Lines        285371   286088     +717     
============================================
+ Hits         230190   230956     +766     
+ Misses        55181    55132      -49     

Components	Coverage Δ
dpp	73.64% <98.18%> (+0.35%)	⬆️
drive	82.49% <ø> (ø)
drive-abci	86.70% <ø> (ø)
sdk	36.55% <ø> (ø)
dapi-client	79.06% <ø> (ø)
platform-version	∅ <ø> (∅)
platform-value	90.79% <ø> (ø)
platform-wallet	76.09% <ø> (ø)
drive-proof-verifier	55.26% <ø> (ø)

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