feat: support for proxy server

[adrian549092]

Description

Partially Fixes #321
The proposed change allows the user to specify a proxy server ip address and port in the .env file to use for the connection to the internet. In certain networks internet access is restricted and is only allowed via a proxy server.

Testing

Note: Requires proxy server such as squid-proxy to be able to test.
Once a proxy server is available, add the following entries to the .env file:

PROXY_ADDRESS="<IP ADDRESS OF PROXY SERVER>"
PROXY_PORT=<TCP PORT FOR PROXY SERVER>

Finally, if a values is provided for PROXY_ADDRESS and a connection to that address is not possible, the connections will fail with a message similar to the one below

[9:04:30 PM] error :: ✖ [nvidia] nvidia founders edition - net::ERR_PROXY_CONNECTION_FAILED at https://www.nvidia.com/en-us/shop/geforce/gpu/?page=1&limit=9&locale=en-us&categ
ory=GPU&gpu=RTX%203080

[jef]

Nice, this will be good for those running in the cloud a well!

[superman500]

Can you add the fields for proxy authentication? or a way to feed it a list of proxies via command line like .........................................npm run start --proxy /users/user1/proxylist.txt

then some format for the proxy files for it to use the proxies like http://username:password@61.18.233.35:60121