urllib.urequest: Support arbitrary HTTP methods on urlopen() level.

This is extension to CPython (CPython does this via Request class).

urllib.urequest/urllib/urequest.py

@@ -1,6 +1,6 @@
 import usocket
 
-def urlopen(url, data=None):
+def urlopen(url, data=None, method="GET"):
     if data is not None and method=="GET":
         method = "POST"
     try: