Move Fabric datagen mixins to datagen module

This way they don't interfere with other mods doing datagen.

Also bump reuse version, to fix issues with globs.

projects/fabric/src/datagen/resources/computercraft-datagen.fabric.mixins.json

@@ -0,0 +1,13 @@
+{
+    "required": true,
+    "package": "dan200.computercraft.mixin",
+    "minVersion": "0.8",
+    "compatibilityLevel": "JAVA_17",
+    "injectors": {
+        "defaultRequire": 1
+    },
+    "mixins": [
+        "TagEntryAccessor",
+        "TagsProviderMixin"
+    ]
+}

projects/fabric/src/datagen/resources/fabric.mod.json

@@ -9,5 +9,8 @@
     },
     "depends": {
         "computercraft": "*"
-    }
+    },
+    "mixins": [
+        "computercraft-datagen.fabric.mixins.json"
+    ]
 }

projects/fabric/src/main/resources/computercraft.fabric.mixins.json

@@ -13,8 +13,6 @@
         "ExplosionDamageCalculatorMixin",
         "ItemEntityMixin",
         "ItemMixin",
-        "ServerLevelMixin",
-        "TagEntryAccessor",
-        "TagsProviderMixin"
+        "ServerLevelMixin"
     ]
 }