Support connect to sub-server directly.

[InkerBot]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like

Add a config field "key",Use the key verify whatever bungeecord could be trust.

Likes "data+sha256(data+key)"

Describe alternatives you've considered

Player could connect sub-server directly.

Additional context

https://github.com/games647/FastLogin/pull/504

https://github.com/Mohist-Community/SodionAuth/blob/master/SodionAuth-Core/src/main/java/red/mohist/sodionauth/core/utils/channel/proxy/serverPacket/ServerPacket.java

[TuxCoding]

Ehm, sorry I don't exactly what this is about. Do you mean a configuration option to forward premium players to a specific server?