• This feature is not currently present in a development build

Is your feature request related to a problem? Please describe.
1.21 bought about a PARTICLES list in the entity metadata - instead of just a varint for the colour of user particles, its now a list inside the datawatcher (index 10 on LivingEntity).

This currently makes wrapping the watcher nigh-impossible as nothing else in the WDW uses lists.

Describe the solution you'd like
A wrapped for PARTICLES.

Describe alternatives you've considered
No idea - if we get a generic Array type on WDWs then we might be able to re-use the existing PARTICLE serialiser, not sure.

Additional context
NMS LivingEntity

private static final EntityDataAccessor<List<ParticleOptions>> DATA_EFFECT_PARTICLES = SynchedEntityData.defineId(LivingEntity.class, EntityDataSerializers.PARTICLES);

NMS Data Serialiser

    public static final EntityDataSerializer<List<ParticleOptions>> PARTICLES = EntityDataSerializer.forValueType(
        ParticleTypes.STREAM_CODEC.apply(ByteBufCodecs.list())
    );

@dmulloy2 do you do bounties in this project?