Add support for proxy when behind a firewall

[jenningsloy318]

Clear and concise description of the problem

we are behind a firewall, thus we need to proxy to access the internet, so require podfetch to support get podcasts via proxy

Suggested solution

• add config to make podfetch to get podcast via proxy

Alternative

No response

Additional context

No response

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guide.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[SamTV12345]

Hmm. How would this work? So PodFetch asks the proxy server how? And what format would this be?

[jenningsloy318]

like we use socks_proxy or http_proxy or https_proxy to make podfetch internet aceess through theese proxies