net: configurable network driver

[abiosoft]

Summary

This introduces configurable network driver to toggle between slirp (Lima's default) and gvproxy.

Flag

colima start --network-driver slirp # default
colima start --network-driver gvproxy # default

Config

# Network configurations for the virtual machine.
network:
  ...
  # Network driver to use (slirp, gvproxy)
  #   - slirp is the default user mode networking provided by Qemu
  #   - gvproxy is an alternative to VPNKit based on gVisor https://github.com/containers/gvisor-tap-vsock
  # Default: slirp
  driver: slirp

[abiosoft]

merging, the lint error is a false-positive.