Fix #537 and some client-side only mixins

[jchung01]

Fixes #537. Also marks some client-side mixins as client-side properly.

[what-the-diff]

PR Summary

• Updated code library
  A new module has been introduced named net.minecraftforge.common.util.FakePlayer in UTDisconnectDupe.java, this provides us with more features to improve performance.

• Optimized Block Hit Delay configuration check
  The decision-making mechanism about Block Hit Delay in the UTLoadingPlugin.java file has been adjusted. This change helps the system to have better control over blocks hit delay.

• Introduced client key for Grasp Control
  A new client key has been added to mixins.tweaks.blocks.hitdelay.json. This will allow frontend or client-side operations related to blocks hit delay to be more controlled and robust.

• Optimized Dismount Key configuration check
  The condition relevant to a separate Dismount Key in UTLoadingPlugin.java file has been adjusted. This gives us more precision in how we manage player dismount actions.

• Introduced client key for Player Dismount operations
  A client key was added in mixins.tweaks.entities.playerdismount.json to manage how a player dismounts. This allows us to have better control over dismount operations from the frontend or client-side.