feat(python): rearrange package and add version comment

- Place the 'package core' declaration on top of the file
- Add a comment indicating the Python version used for generation
- Automatically generate the 'Escape' function
- Update the header to include version comment
(main)

Author: rayakame

scripts/py/reserved_keywoards.py

@@ -9,9 +9,9 @@
 
     with open(path, "w") as go_file:
         # Write the function header for escape
-        go_file.write(f"""package core
-// Auto-generated using python; DO NOT EDIT
-// py {sys.version}""")
+        go_file.write(f"""// Package core Auto-generated using python; DO NOT EDIT
+// py {sys.version}
+package core""")
         go_file.write("""
 func Escape(s string) string {
     if IsReserved(s) {