Expose MiningDrillPrototype#vector_to_place_result property to LuaEntityPrototype

[rimbas]

Please expose MiningDrillPrototype#vector_to_place_result to control stage. Maybe as LuaEntityPrototype#mining_drill_drop_position.

Currently you'd have to spawn in a temporary mining drill and get its drop position via LuaEntity#drop_position.

[boskid]

Implemented for 1.1.106