fix: ensure network.Dial and MakeHTTPClient use socks5 proxy

The package `network/v2/proxy_network.go` does not wrap `network.Dial`
and `network.MakeHTTPClient`, which causes them to bypass the SOCKS5
proxy and initiate TCP connections directly from the local machine.

Fix preferIPOnlyIPv6

Add document about best practices

Decrease relay buffer size

Even if it makes sense to have a huge buffers, we do artificial delays
now. In that case we could achieve the same results with a lower buffer.
If not, then we won't send a packet bigger that this value

Add docs about doppelganger

Have a noise of variable size

Fix android ping

Make DRS optional

Access command should use native dialer instead of network one

Speed up Github actions

Use native dialer for scout

Use native dialer to communicate with fronting domain

Doppleganger