fix: add mineable pickaxe and needs_iron_tool block tags

All three mod blocks used requiresCorrectToolForDrops() but had no
mineable tag entries, making them unharvestable in survival. Iron
pickaxe (or better) is now required to get drops.

Author: MrSilly07

src/main/resources/data/minecraft/tags/block/mineable/pickaxe.json

@@ -0,0 +1,8 @@
+{
+  "replace": false,
+  "values": [
+    "researchcube:research_station",
+    "researchcube:drive_crafting_table",
+    "researchcube:processing_station"
+  ]
+}

src/main/resources/data/minecraft/tags/block/needs_iron_tool.json

@@ -0,0 +1,8 @@
+{
+  "replace": false,
+  "values": [
+    "researchcube:research_station",
+    "researchcube:drive_crafting_table",
+    "researchcube:processing_station"
+  ]
+}