[main < T622] Add convert str2object

e2e/convert_test/test_str2object1/file1

@@ -0,0 +1,4 @@
+"_id","_labels","a","b","prop","did_it","_start","_end","_type"
+"0",":Dog","3","[""1"", ""2"", 3]","2","","","",""
+"1",":Human","","[[""1"",{""key"": 5}]]","","yes","","",""
+"5",":Cat","","{""prop"": {""prop2"": {""key"": 10}}}","","","0","1","loves"

e2e/convert_test/test_str2object1/test.yml

@@ -0,0 +1,8 @@
+query: >
+    LOAD CSV FROM "/_file1" WITH header AS row
+    RETURN convert.str2object(row.b) AS list;
+
+output: 
+  - list: [ "1","2", 3]
+  - list: [["1",{"key": 5}]]
+  - list: {"prop": {"prop2": {"key": 10}}}

python/convert.py

@@ -0,0 +1,9 @@
+import mgp
+from json import loads
+
+
+@mgp.function
+def str2object(string: str) -> mgp.Any:
+    if string:
+        return loads(string)
+    return None