[DRAFT] ItemStack-sensitive method for shears in dispensers

[Random832]

Dispensers currently have no way to send the level of fortune/looting to the entity being sheared. This could have been done in principle with the IForgeShearable interface but wasn't ever implemented to do so, and #8753 is a proposed change to remove that system in favor of tool actions.

Ultimately I'm not particularly happy with where this leaves block shearing - the fact that dispensers have never supported all vanilla block shearing actions [you can't e.g. carve a pumpkin, or trim vines, with a dispenser] makes it difficult to consider implementing this in a general way [two well-known mods that add custom beehives register their own replacement dispenser actions, and even prior to my other PR beehives never implemented IForgeShearable].

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