Feature Request: Option to set/unset some settings from the CLI

[junaid2005p]

Is your feature request related to a problem? Please describe.
Currently there is no way to set settings like default download dir or proxy from the CLI

Describe the solution you'd like
There should be ways to override settings for a particular download from the CLI as well as set or change a setting persistentl from the CLI

Additional context
Something like
surge add --proxy " " (for temporary settings override)
surge set config proxy " " (for persistent settings)