Egg laying drop from chickens is hardcoded

Eggs which chickens randomly lay are not controlled by a loot table, but instead are hardcoded. This issue was created due to the fix for MC-267866.

Steps to Reproduce:

Since this bug report is about functionality that is missing, the only way to verify this issue is to look into the various loot tables in the game either by decompressing the game jar, or looking in the code of the game.

Code analysis:

public void aiStep() {
. . .
      this.flap += this.flapping * 2.0F;
      if (!this.level().isClientSide && this.isAlive() && !this.isBaby() && !this.isChickenJockey() && --this.eggTime <= 0) {
         this.playSound(SoundEvents.CHICKEN_EGG, 1.0F, (this.random.nextFloat() - this.random.nextFloat()) * 0.2F + 1.0F);
-> ISSUE START
         this.spawnAtLocation(Items.EGG);
-> ISSUE END
         this.gameEvent(GameEvent.ENTITY_PLACE);
         this.eggTime = this.random.nextInt(6000) + 6000;
      }
. . .
   }

Suggested Fix

Introduce a loot table for eggs dropping from chickens.

Notes:

Related to MC-94610 MC-149589 MC-269838 MC-269839 MC-269873 MC-269874 MC-269875