Add devterm tools and TUI menu

devterm/tools/json_tool.py

@@ -0,0 +1,11 @@
+import json
+
+
+def format_json(data: str, indent: int = 2) -> str:
+    parsed = json.loads(data)
+    return json.dumps(parsed, indent=indent)
+
+
+def validate_json(data: str) -> bool:
+    json.loads(data)
+    return True