test(dpp): improve coverage for cbor canonical, json utils, and document accessors

[QuantumExplorer]

Issue being fixed or feature implemented

Improves unit test coverage for four DPP utility modules that had low coverage:

• util/cbor_value/canonical.rs (28.8% -> improved)
• util/json_value/mod.rs (22.8% -> improved)
• document/specialized_document_factory/v0/mod.rs (8.2% -> improved)
• data_contract/document_type/accessors/mod.rs (42.6% -> improved)

What was done?

Added 160 new unit tests across four files:

canonical.rs (55 new tests):

• CborCanonicalMap construction (new, default, from_vector, from_serializable)
• Insert, remove, get, get_mut, set operations
• Canonical sorting per RFC 7049 (shorter keys first, then lexicographic)
• Recursive sorting of nested maps and maps inside arrays
• Serialization to bytes and round-trip deserialization
• to_value_unsorted, to_value_sorted, to_value_clone
• TryFrom<CborValue> and From impls for Vec and BTreeMap
• ValuesCollection trait (get, get_mut, remove)
• ReplacePaths trait (replace_paths, replace_path, get_path_mut)
• value_to_bytes with Bytes, Text (base58), Array, and error cases
• value_to_hash with Bytes, Text (base58), Array, and error cases

json_value/mod.rs (52 new tests):

• All JsonValueExt trait methods: push, insert, remove, remove_into
• Numeric getters: get_u8, get_u32, get_u64, get_i64, get_f64
• Other getters: get_string, get_bytes, get_bool
• Path navigation: get_value, get_value_mut, get_value_by_path, get_value_by_path_mut
• Mutation: remove_u32, add_protocol_version, remove_value_at_path_into
• Free functions: get_value_mut, get_value_from_json_path, get_value_from_json_path_mut
• insert_with_path for deeply nested structure creation
• Error cases for all methods (missing property, wrong type, non-object/array)

document_type/accessors/mod.rs (37 new tests):

• All DocumentTypeV0Getters methods on DocumentType, DocumentTypeRef, DocumentTypeMutRef
• DocumentTypeV0Setters (set_data_contract_id) on DocumentType and DocumentTypeMutRef
• DocumentTypeV0MutGetters (schema_mut)
• DocumentTypeV1Getters on V0 variants (verify None/empty defaults)
• DocumentTypeV1Setters on V0 variants (verify no-op behavior)
• Tests with multiple fixture document types (indexedDocument, noTimeDocument, withByteArrays, niceDocument)
• to_owned_document_type from ref

specialized_document_factory/v0/mod.rs (10 new tests):

• Factory construction with default and custom entropy generators
• Document creation with valid and invalid document type names
• Document creation without time-based properties
• Extended document creation (valid and invalid)
• is_ownership_the_same helper with same, different, single, and empty ID sets

How Has This Been Tested?

All 164 tests pass with cargo test -p dpp:

test result: ok. 164 passed; 0 failed; 0 ignored; 0 measured; 904 filtered out

Code was formatted with cargo fmt -p dpp and compiles without warnings.

Breaking Changes

None. This PR only adds tests.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

[codecov]

Codecov Report

❌ Patch coverage is 98.90756% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.87%. Comparing base (2fb112c) to head (5c4082f).
⚠️ Report is 19 commits behind head on v3.1-dev.

Files with missing lines	Patch %	Lines
packages/rs-dpp/src/util/cbor_value/canonical.rs	97.28%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           v3.1-dev    #3383      +/-   ##
============================================
+ Coverage     75.87%   76.87%   +1.00%     
============================================
  Files          2912     2914       +2     
  Lines        283860   287443    +3583     
============================================
+ Hits         215375   220975    +5600     
+ Misses        68485    66468    -2017     

Components	Coverage Δ
dpp	69.00% <98.90%> (+3.28%)	⬆️
drive	81.66% <ø> (+0.01%)	⬆️
drive-abci	85.98% <ø> (-0.01%)	⬇️
sdk	31.25% <ø> (ø)
dapi-client	79.06% <ø> (ø)
platform-version	∅ <ø> (∅)
platform-value	73.84% <ø> (+15.38%)	⬆️
platform-wallet	60.40% <ø> (ø)
drive-proof-verifier	48.00% <ø> (ø)

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