Loot Table Modifier generator (#758)

* Loot Table Modifier loot_modifier generator

Should support everything currently implemented

* Translation keys

* Make 'actions' and 'predicates' always a list

Seems simpler to understand and a list of one entry behaves exactly the same

* Update loot-table-modifier.mcdoc

Should match currently latest commit

* Fix loot modifier path in datapack being incorrect

* Match v2 alpha 1

* Import LootPoolEntry

* Add files via upload

* Revert "Add files via upload"

This reverts commit 7e9c50ee10.

* add condition_add action

* Add union member name overrides

Co-authored-by: Misode <misoloo64@gmail.com>

---------

Co-authored-by: Misode <misoloo64@gmail.com>

src/locales/en.json

@@ -92,6 +92,7 @@
   "generator.jukebox_song": "Jukebox Song",
   "generator.lang": "Language",
   "generator.loot_table": "Loot Table",
+  "generator.loot-table-modifier:loot_modifier": "Loot Modifier",
   "generator.model": "Model",
   "generator.texture_meta": "Texture Metadata",
   "generator.neoforge:biome_modifier": "Biome Modifier",
@@ -229,6 +230,7 @@
   "partner.fabric": "Fabric",
   "partner.immersive_weathering": "Immersive Weathering",
   "partner.lithostitched": "Lithostitched",
+  "partner.loot-table-modifier": "Loot Table Modifier",
   "partner.neoforge": "NeoForge",
   "partner.obsidian": "Obsidian",
   "partner.ohthetreesyoullgrow": "Oh The Trees You'll Grow",