Defining SynchedEntityData via BoatMixin causes issues with other mods' boats

**Description of the Bug Encountered** Wilder Wild defines a new type of SynchedEntityData for the vanilla Boat entity via mixin here: https://github.com/FrozenBlock/WilderWild/blob/ba9172309ec6a26700c5b84eb45d2b0a95e5e77d/src/main/java/net/frozenblock/wilderwild/mixin/entity/penguin/BoatMixin.java#L43-L44 https://github.com/FrozenBlock/WilderWild/blob/ba9172309ec6a26700c5b84eb45d2b0a95e5e77d/src/main/java/net/frozenblock/wilderwild/mixin/entity/penguin/BoatMixin.java#L50-L53 This causes issues with other mods that do the same thing, or even just extend the Boat class for their own boat types, due to reasons detailed in https://github.com/FabricMC/fabric-api/issues/1049 and https://github.com/FabricMC/fabric-api/issues/3482 **Steps To Reproduce** 1. Install Wilder Wild and [Nature's Spirit](https://modrinth.com/mod/natures-spirit/version/TRMapjpU) v2.2.5 (the last version that extends vanilla's Boat class for its own boats) 2. Start the game, join a world, etc. 3. Place a boat from Nature's Spirit 4. The game crashes (if it doesn't, add some other mods; the crash is inconsistent) **Expected Behavior** No crash **Screenshots** N/A **Logs** Example with Nature's Spirit: https://gist.github.com/unilock/7c49bb6d9b8f82ca4adf7bae6479f3ca **Additional context** Same issue as https://github.com/FrozenBlock/WilderWild/issues/462 and https://github.com/FrozenBlock/WilderWild/issues/468, only with boat boosting instead of chest boat types this time Perhaps Fabric's [Data Attachment API](https://docs.fabricmc.net/develop/data-attachments) could be used instead?