veeso / ic-dbms / 21565321640

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feat(api) implement `Json` data type

Add Json data type to ic-dbms-api with full DataType trait support.

Implementation:
- Json struct wrapping serde_json::Value with cached string repr
- Default value is `null` (not empty object)
- Hierarchical type-based ordering (Ord/PartialOrd):
  Null < Bool < Number < String < Array < Object
- Recursive Hash implementation (key-order independent for objects)
- Memory encoding: 2-byte length prefix + JSON string
- Candid serialization as text
- Serde serialize/deserialize support

Integration:
- Add Json variant to Value enum with as_json() accessor
- Add Json to DataTypeKind enum
- Add InvalidJson variant to DecodeError

Tests:
- 91 tests covering ordering, hashing, encoding/decoding,
  Candid roundtrip, serde, FromStr, Display, and edge cases

closes #13

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