utils.infer_storage_options does not support passwords with hashes

print (fsspec.utils.infer_storage_options('ftp://user:password@host:21/path'))
{'protocol': 'ftp', 'path': '/path', 'host': 'host', 'port': 21, 'username': 'user', 'password': 'password'}

print (fsspec.utils.infer_storage_options('ftp://user:password#@host:21/path'))

Traceback (most recent call last):
  File "filesystem.py", line 481, in <module>
    print (fsspec.utils.infer_storage_options('ftp://user:password#@host:21/path'))
  File "...\lib\site-packages\fsspec\utils.py", line 72, in infer_storage_options
    if parsed_path.port:
  File "...\lib\urllib\parse.py", line 167, in port
    port = int(port, 10)
ValueError: invalid literal for int() with base 10: 'password'

Start in fsspec.utils.infer_storage_options, at the parsing logic around utils.py line 72, and reproduce the two FTP examples from the issue. Check how a hash in the password affects parsed_path.port; done means the hashed-password URL is accepted and returns storage options with the password parsed correctly, while the existing example still works.