gh-155358: Use named attributes with urllib.parse module

[vstinner]

urlparse(), replace:

• parts[0] => parts.scheme
• parts[1] => parts.netloc
• parts[2] => parts.path
• parts[3] => parts.query
• parts[4] => parts.fragment

urlsplit(), replace:

• parts[0] => parts.scheme
• parts[1] => parts.netloc
• parts[2] => parts.path
• parts[3] => parts.query
• parts[4] => parts.fragment

• Issue: Deprecate the tuple API (object[index]) of structseq types (ex: os.stat_result) #155358