[Feature]: Change Role Syncs to be grouped by mc -> discord or discord -> mc, rather than flag based

### 🚀 Description

Currently, due to how our system works, you can either only sync ranks with discord roles, or discord roles with ranks.

In ideal, very hard to manage cases, you can do both.

The proposal is to have grouped syncs, that allow you to sync certain ranks to discord roles, and certain roles to ranks.

Otherwise, the sync flag needs to be moved into the individual sync, to allow toggling where or how it syncs

### 💡 Use Case

_No response_

No files, tests, or entry points are named. Start by locating the role-sync configuration and implementation, then determine how sync direction is currently represented. Done means supporting grouped Minecraft-to-Discord and Discord-to-Minecraft syncs, or equivalent per-sync direction controls, without relying on one global flag.

Written by the indexing model from the issue text.