/claim #679

Description

This PR implements the Json data type as requested in Issue #679.

Changes Checked:

• Json ADT with Object, Array, String, Number, Boolean, Null cases.
• JsonError implementation with path and position info.
• JsonDecoder and JsonEncoder type classes.
• JsonSelection for fluent navigation.
• Comprehensive test suite (JsonSpec) verifying all functionality.
• StackOverflow bug fix in Json.equals.
• Compilation issues resolved (imports, name shadowing, linter warnings).

Verification

All tests in JsonSpec passed successfully. (See attached screenshot/video below)

https://github.com/user-attachments/assets/4d875e00-cc09-4e12-9dbf-7d203366baf0