Add optional id property to test schema (#698)

- Added optional id property for test cases with detailed description
- Added optional id property for individual tests in /test
- Both id properties are optional for backward compatibility
- IDs will be made required once all test files have them

The id property enables stable tracking of test cases and tests
across description changes and file reorganization.

Refs #698

Author: AnirudhJindal

test-schema.json

@@ -11,6 +11,10 @@
         "type": "object",
         "required": [ "description", "schema", "tests" ],
         "properties": {
+            "id": {
+                "description": "A stable, unique identifier for this test case. Must be unique within the version. Should never change even if the description or other properties change.",
+                "type": "string"
+            },
             "description": {
                 "description": "The test case description",
                 "type": "string"
@@ -102,6 +106,10 @@
             "type": "object",
             "required": [ "description", "data", "valid" ],
             "properties": {
+                "id": {
+                    "description": "A stable, unique identifier for this test. Must be unique within the test case. Should never change even if the description or other properties change.",
+                    "type": "string"
+                },
                 "description": {
                     "description": "The test description, briefly explaining which behavior it exercises",
                     "type": "string"
@@ -121,4 +129,4 @@
             "additionalProperties": false
         }
     }
-}
+}