feat: add @rspack/core as an optional peer dependency (#1829)

Author: chenjiahan

package.json

@@ -56,8 +56,17 @@
     "tapable": "^2.0.0"
   },
   "peerDependencies": {
+    "@rspack/core": "0.x || 1.x",
     "webpack": "^5.20.0"
   },
+  "peerDependenciesMeta": {
+    "@rspack/core": {
+      "optional": true
+    },
+    "webpack": {
+      "optional": true
+    }
+  },
   "keywords": [
     "webpack",
     "plugin",