🎨 Add variable support for http client

frontend/src/views/editor/extensions/httpclient/language/http.parser.terms.ts

@@ -2,42 +2,55 @@
 export const
   LineComment = 1,
   Document = 2,
-  RequestStatement = 3,
-  Method = 4,
-  GET = 5,
-  POST = 6,
-  PUT = 7,
-  DELETE = 8,
-  PATCH = 9,
-  HEAD = 10,
-  OPTIONS = 11,
-  CONNECT = 12,
-  TRACE = 13,
-  Url = 14,
-  StringLiteral = 15,
-  Block = 18,
-  Property = 19,
-  NumberLiteral = 22,
-  Unit = 23,
-  AtRule = 25,
-  JsonRule = 26,
-  AtKeyword = 27,
-  JsonKeyword = 28,
-  JsonBlock = 29,
-  JsonProperty = 30,
-  JsonTrue = 32,
-  True = 33,
-  JsonFalse = 34,
-  False = 35,
-  JsonNull = 36,
-  Null = 37,
-  FormDataRule = 38,
-  FormDataKeyword = 39,
-  UrlEncodedRule = 40,
-  UrlEncodedKeyword = 41,
-  TextRule = 42,
-  TextKeyword = 43,
-  JsonObject = 44,
-  JsonMember = 45,
-  JsonValue = 46,
-  JsonArray = 49
+  VarDeclaration = 3,
+  AtKeyword = 4,
+  VarKeyword = 5,
+  JsonBlock = 8,
+  JsonProperty = 9,
+  StringLiteral = 12,
+  NumberLiteral = 13,
+  Unit = 14,
+  VariableRef = 15,
+  JsonTrue = 16,
+  True = 17,
+  JsonFalse = 18,
+  False = 19,
+  JsonNull = 20,
+  Null = 21,
+  RequestStatement = 23,
+  Method = 24,
+  GET = 25,
+  POST = 26,
+  PUT = 27,
+  DELETE = 28,
+  PATCH = 29,
+  HEAD = 30,
+  OPTIONS = 31,
+  CONNECT = 32,
+  TRACE = 33,
+  Url = 34,
+  Block = 35,
+  Property = 36,
+  AtRule = 38,
+  JsonRule = 39,
+  JsonKeyword = 40,
+  FormDataRule = 41,
+  FormDataKeyword = 42,
+  UrlEncodedRule = 43,
+  UrlEncodedKeyword = 44,
+  TextRule = 45,
+  TextKeyword = 46,
+  ResponseDeclaration = 47,
+  ResponseKeyword = 48,
+  ResponseStatus = 49,
+  StatusCode = 50,
+  ErrorStatus = 51,
+  ResponseTime = 52,
+  TimeValue = 53,
+  ResponseTimestamp = 54,
+  Timestamp = 55,
+  ResponseBlock = 56,
+  JsonObject = 57,
+  JsonMember = 58,
+  JsonValue = 59,
+  JsonArray = 62