Make "Auto Jump Replacement" more compatible

[jchung01]

Fixes #523.

[what-the-diff]

PR Summary

• Integration of unique import from SpongePowered Mixin
  The team has integrated a new import from the org.spongepowered.asm.mixin.Unique library. This is critical for upcoming enhancements.
• Introduction of 'step assistance' for player
  A new variable- Field 'stepAssisted' has been created. This will add a 'step assistance' feature for the player.
• Modification in AutoJump Method
  The method previously used for 'AutoJump' has been modified. Now, before setting the player's step height, we check if the player is in the 'step-assisted' mode. It provides a more responsive and user-intuitive jumping experience.
• Condition-based Step Assists
  The system is now equipped to perform auto-checks. If auto jump is enabled and the player's step height is less than 1.0f, the system will set 'stepAssisted' mode on and update the player's step height accordingly. It brings a smoother and more accurate stepping experience.
• Condition for turning off Step Assists
  A new condition has been added to turn off the 'step-assisted' mode whenever needed. If 'stepAssisted' is true and the player's step height is more than 0.6f, the system will deactivate the 'step-assisted' mode. This ensures an adaptable player experience based on game events.
• Various edits on initial lines of the code
  Non-functional but important adjustments have been made to the initial 28 lines of code including imports and annotations. These are to improve code readability and maintainability.

[jchung01]

My initial change technically worked, but it was changing step height between 0.6 and 1.25 every other tick. This way should be better and I think functionally behaves the same.