add json (#1030)

Author: larshp

package.json

@@ -15,11 +15,11 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@abaplint/cli": "^2.113.237",
+    "@abaplint/cli": "^2.113.243",
     "@abaplint/database-pg": "^2.11.78",
     "@abaplint/database-sqlite": "^2.11.78",
-    "@abaplint/runtime": "^2.12.9",
-    "@abaplint/transpiler-cli": "^2.12.9",
+    "@abaplint/runtime": "^2.12.11",
+    "@abaplint/transpiler-cli": "^2.12.11",
     "0x": "^6.0.0"
   }
 }

src/json/#ui2#cl_json.clas.abap

@@ -17,6 +17,7 @@ CLASS /ui2/cl_json DEFINITION PUBLIC.
                END OF c_bool.
 
     TYPES tribool TYPE c LENGTH 1.
+    TYPES json TYPE string.
 
     CLASS-METHODS raw_to_string
       IMPORTING