Added proxy support to refresh

[na4ma4]

Some channels require proxies to download from other regions, this adds --proxy to the refresh command.

[na4ma4]

There was some debug code that caused the command to fail during normal operation, I commented that out as well.

Loading channel.test archive..
Automatically migrating archive from v3 to v4, a backup has been made at channel.test/yark.bak
Downloading metadata..
Traceback (most recent call last):
  File "/usr/bin/yark", line 8, in <module>
    sys.exit(_cli())
  File "/usr/lib/python3.10/site-packages/yark/cli.py", line 148, in _cli
    archive.metadata(config)
  File "/usr/lib/python3.10/site-packages/yark/archive.py", line 164, in metadata
    with open("demo/dump.json", "w+") as file:
FileNotFoundError: [Errno 2] No such file or directory: 'demo/dump.json'

[Owez]

Thanks for submitting, solid PR :)