Add hurtEnemy callback to ItemBuilder (1.20.1)

[squoshi]

Description

Ported the previous pull request I made to 1.20.1.

Example Script

StartupEvents.registry('item', event => {
    event.create('test')
        .hurtEnemy(ctx => {
            console.log([ctx.item, ctx.target, ctx.attacker])
            global.attackTest(ctx)
        return true
    })
})

global.attackTest = function(ctx) {
    let exp = ctx.target.level.createExplosion(ctx.target.x, ctx.target.y + 1, ctx.target.z)
    exp.damagesTerrain(false)
    exp.strength(1.25)
    exp.explode()
}

Other details