Add new manager and gateway component for VILLAS signaling server

[stv0g]

In GitLab by @stv0g on Mar 16, 2022, 13:16

[stv0g]

mentioned in issue web-backend-go#88

[stv0g]

In GitLab by @skolen on Mar 23, 2022, 09:24

marked this issue as related to web#373