fix: convert numeric identity keys to strings (#40)

Convert numeric identity keys to string type across all test case files
for consistency with schema requirements.

- Fixed 102 test case files with numeric identity keys
- Identity keys changed from number to string (e.g., 32103705 -> "32103705")

Author: gagantrivedi

test_cases/test_042b3a46-4575-419a-8a2f-62baa3226668__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "042b3a46-4575-419a-8a2f-62baa3226668",
-      "key": 32103705,
+      "key": "32103705",
       "traits": {
         "age": 20,
         "favourite_colour": "yellow"

test_cases/test_0cfd0d72-4de4-4ed7-9cfb-d80dc3dacead__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "0cfd0d72-4de4-4ed7-9cfb-d80dc3dacead",
-      "key": 32103813,
+      "key": "32103813",
       "traits": {
         "age": 47,
         "favourite_colour": "green"

test_cases/test_0d0eb3b4-aab5-4a2e-b82a-47e84c57c64d__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "0d0eb3b4-aab5-4a2e-b82a-47e84c57c64d",
-      "key": 32103770,
+      "key": "32103770",
       "traits": {
         "age": 28,
         "favourite_colour": "red"

test_cases/test_11586d45-02f1-48ac-b640-741447251909__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "11586d45-02f1-48ac-b640-741447251909",
-      "key": 32103727,
+      "key": "32103727",
       "traits": {
         "age": 22,
         "favourite_colour": "orange"

test_cases/test_15ef44aa-34b5-4366-a201-c80e33d9f169__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "15ef44aa-34b5-4366-a201-c80e33d9f169",
-      "key": 32103696,
+      "key": "32103696",
       "traits": {
         "age": 32,
         "favourite_colour": "yellow"

test_cases/test_170effbe-4388-49a5-9872-700688b628b9__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "170effbe-4388-49a5-9872-700688b628b9",
-      "key": 32103704,
+      "key": "32103704",
       "traits": {
         "age": 69,
         "favourite_colour": "blue"

test_cases/test_18edb157-34cc-4896-aa35-76a7ee68fe68__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "18edb157-34cc-4896-aa35-76a7ee68fe68",
-      "key": 32103815,
+      "key": "32103815",
       "traits": {
         "age": 46,
         "favourite_colour": "yellow"

test_cases/test_1969664e-a236-46e7-91af-84dca50a313b__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "1969664e-a236-46e7-91af-84dca50a313b",
-      "key": 32103787,
+      "key": "32103787",
       "traits": {
         "age": 43,
         "favourite_colour": "red"

test_cases/test_1b33fc3f-3c0e-480c-acce-1937779c743b__default.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "1b33fc3f-3c0e-480c-acce-1937779c743b",
-      "key": 32103782,
+      "key": "32103782",
       "traits": {
         "age": 4,
         "favourite_colour": "orange"

test_cases/test_1bde8445-ca19-4bda-a9d5-3543a800fc0f__context_values.json

@@ -66,7 +66,7 @@
     },
     "identity": {
       "identifier": "1bde8445-ca19-4bda-a9d5-3543a800fc0f",
-      "key": 32227281,
+      "key": "32227281",
       "traits": {}
     },
     "segments": {