Implements the PrePlayerAttackEntityEvent (#2473)
* PrePlayerAttackEntityEvent
Implements the PrePlayerAttackEntityEvent, which fires when the player tries to attack an entity.
* Updated both files
* REMOVES THE STRAY NEW LINE
* Update PrePlayerAttackEntityScriptEvent.java
Removed useless import, updated event line & updated matcher accordingly, moved context for tags into triggers, and fixed formatting issue.
* Update PrePlayerAttackEntityScriptEvent.java
* Modified event line
* Modified player link meta
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commit: a0b06e6)
