add/remove peer without interface restart

[konrad4444]

Is your feature request related to a problem? Please describe.
When adding or removing peer the wireguard interface gets restarted causing everyone on vpn to got frozen connections for couple of seconds, which sometimes result in ssh sessions terminated. That is unnecessary, thare are commands to add new peer and to remove peer without reloading the whole configuration.

Describe the solution you'd like
Commands to add new peer and to remove peer without reloading the whole configuration:
wg set "wg-interface" peer "peer-public-key" remove
wg set "wg-interface" peer "peer-public-key" allowed-ips "ip_address"

[joseantmazonsb]

Will be included when #115 is merged