API-accessible way to allow using the gamemode switcher for non-ops #13489
Description
Is your feature request related to a problem?
In previous versions it was possible to allow non-ops such as server moderators to use the gamemode switcher by using the sendOpLevel API, but since the 1.21.6 update the gamemode switcher now has its own packet with a server side permission level check, making this approach no longer possible.
Describe the solution you'd like.
I'm proposing adding a new event that's fired when a ServerboundChangeGameModePacket is received by the server, allowing plugins to override vanilla's permission check with their own.
Describe alternatives you've considered.
Adding a minecraft.command.gamemode permission check, but ideally I'd like it to be more granular and be able to implement a per-gamemode permission to allow access to survival & spectator but not creative.
Other
No response