Embed a loot table definition directly inside a block/entity

The two loot table tags, LootTable and DeathLootTable, only support a file path from which a loot table is loaded. Therefore, it is impossible to change the drops of a mob/block to an arbitrary loot table with commands alone -- prior file editing is required.

I suggest the ability to embed the entire loot table directly in the string itself, so you can have both a file path or a loot table.

e.g.
summon pig ~ ~ ~ {DeathLootTable:"{\"pools\":[{\"rolls\":{\"min\":1,\"max\":5},\"entries\":[{\"type\":\"item\",\"weight\":1,\"name\":\"minecraft:diamond_pickaxe\"}]}]}"}

Currently, this does nothing, and the only way to make a pig drop between one and five pickaxes is to put that loot table in a file instead.