Move parcelize checkers testdata to :parcelize-compiler module

plugins/parcelize/parcelize-compiler/testData/diagnostics/customCreator.kt

@@ -0,0 +1,25 @@
+// WITH_STDLIB
+package test
+
+import kotlinx.parcelize.Parcelize
+import android.os.Parcelable
+import android.os.Parcel
+
+@Parcelize
+class A(val a: String) : Parcelable {
+    companion object {
+        @JvmField
+        val <error descr="[CREATOR_DEFINITION_IS_NOT_ALLOWED] 'CREATOR' definition is not allowed. Use 'Parceler' companion object instead">CREATOR</error> = object : Parcelable.Creator<A> {
+            override fun createFromParcel(source: Parcel): A = A("")
+            override fun newArray(size: Int) = arrayOfNulls<A>(size)
+        }
+    }
+}
+
+@Parcelize
+class B(val b: String) : Parcelable {
+    companion object <error descr="[CREATOR_DEFINITION_IS_NOT_ALLOWED] 'CREATOR' definition is not allowed. Use 'Parceler' companion object instead">CREATOR</error> : Parcelable.Creator<B> {
+        override fun createFromParcel(source: Parcel): B = B("")
+        override fun newArray(size: Int) = arrayOfNulls<B>(size)
+    }
+}