[Feature Request] Optional Config Setting: Require same version

Feature Description

While limited, there are certain situations where you're still able to join the server even if you have mod version mismatches. For example (JEI version differing on the client vs the server).

I'm requesting an option in the server config (it would be disabled by default), the server can require players to update their modpack and will prevent the player from joining until doing so.

I've had issue where certain mods will have updates (no new features/changes) that are just bug fixes and crash fixes, and they will still be able to join the server if the server updated the mod, but the client hasnt. 90% of the time, its not a problem, but they'll sometimes crash, or cause bugs/exploits because they are still on the older version.

Obviously the player can go in and manually change their bcc-common.toml file to the newer version. But this will at least help the non-problem people understand they need to update their before joining the server

Start by locating the server configuration handling and the existing mod-version compatibility check or player-join validation. Confirm how mismatches are currently accepted, then define the configuration's disabled-by-default behavior and verify that enabled enforcement blocks clients with differing mod versions while compatible clients can still join.