feat: request variables (#3825)

Co-authored-by: jamesgeorge007 <jamesgeorge998001@gmail.com>

packages/hoppscotch-cli/src/__tests__/samples/collections/fails-coll.json

@@ -5,7 +5,7 @@
     "folders": [],
     "requests": [
       {
-        "v": "1",
+        "v": "2",
         "endpoint": "https://echo.hoppscotch.io/<<HEADERS_TYPE1>>",
         "name": "",
         "params": [],
@@ -23,10 +23,11 @@
         "body": {
           "contentType": "application/json",
           "body": "{\n\"test\": \"<<HEADERS_TYPE1>>\"\n}"
-        }
+        },
+        "requestVariables": [],
       },
       {
-        "v": "1",
+        "v": "2",
         "endpoint": "https://echo.hoppscotch.dio/<<HEADERS_TYPE2>>",
         "name": "success",
         "params": [],
@@ -44,7 +45,8 @@
         "body": {
           "contentType": "application/json",
           "body": "{\n\"test\": \"<<HEADERS_TYPE2>>\"\n}"
-        }
+        },
+        "requestVariables": []
       }
     ]
   }