Added Support for ShardManager

[DenuxPlays]

Is your feature request related to a problem? Please describe. /

Describe the solution you'd like Instead of setting JDA instance set a shardmanager instance.

Describe alternatives you've considered Loop trough all shard, get their JDA instance and start DIH4JDA for each one.

Additional context A current work around is to loop over each shard, get their JDA instance and register DIH4JDA for each shard.