[unity] Added package json file without unity dependency for packaging scripts.

spine-unity/Modules/com.esotericsoftware.spine.ui-toolkit/package-no-spine-unity-dependency.json

@@ -0,0 +1,29 @@
+{
+  "name": "com.esotericsoftware.spine.ui-toolkit",
+  "displayName": "Spine UI Toolkit [Experimental]",
+  "description": "This plugin provides UI Toolkit integration for the spine-unity runtime.\n\nPrerequisites:\nIt requires a working installation of the spine-unity runtime, version 4.3.42 or newer and Unity 6000.3 or newer (requires [this bugfix](https://issuetracker.unity3d.com/issues/some-default-uxmlconverters-are-dependent-on-the-current-culture)).\n(See http://esotericsoftware.com/git/spine-runtimes/spine-unity)",
+  "version": "4.3.0-preview.5",
+  "unity": "6000.3",
+  "author": {
+    "name": "Esoteric Software",
+    "email": "contact@esotericsoftware.com",
+    "url": "http://esotericsoftware.com/"
+  },
+  "dependencies": {
+    "com.unity.modules.uielements": "1.0.0"
+  },
+  "keywords": [
+    "spine",
+    "ui toolkit",
+    "ui",
+    "preview"
+  ],
+  "hideInEditor": false,
+  "samples": [
+    {
+      "displayName": "Examples",
+      "description": "Contains examples for UI Toolkit",
+      "path": "Samples~/Examples"
+    }
+  ]
+}

spine-unity/Modules/com.esotericsoftware.spine.ui-toolkit/package-no-spine-unity-dependency.json.meta

@@ -0,0 +1,7 @@
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+guid: c4ea9b77ff68bb74e9931e954851b3ba
+TextScriptImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
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