integrate tun2torsocks

part of leap/bitmask_android!195 (closed)

assigned to @cyberta

added 20 commits

• 293adee4...3e606f5f - 11 commits from branch main
• 43b6bee9 - implement tun2torsocks
• 18accce3 - implement logging interface for tun2torsocks
• 200fc2b1 - update go.sum
• 070b3582 - remove UDP connection handler, DNS will be handled by the VPN provider's DNS...
• 22dd2cbf - remove unused udp handler
• 2b12fe91 - use a better name for the callback interface responsible for writing packets...
• 219f52d9 - add and improve comments
• a1439342 - fix logging formatting
• c807103b - don't log each write and read action

Compare with previous version

mentioned in merge request leap/bitmask_android!203 (closed)

mentioned in issue go-packet-transfer#1