add init_paths to handle sys.path setup for importing shared modules like paths.py

core/scripts/hysteria2/init_paths.py

@@ -0,0 +1,7 @@
+import sys
+from pathlib import Path
+
+core_scripts_dir = Path(__file__).resolve().parents[1]
+
+if str(core_scripts_dir) not in sys.path:
+    sys.path.append(str(core_scripts_dir))