Proxy configuration struct. Proxy address can start with http/s or socks5. It is also possible to only specify address field and when you call Proxy.get_config/1 then we try to parse URI to figure out type, auth details in this case default values will be also applied.

# 2 fields with default values
%Proxy{
  address: "socks5://user:pass@awesome.host:port"
  username: "user",
  password: "pass"
}