Move parcelize checkers testdata to :parcelize-compiler module

plugins/parcelize/parcelize-compiler/testData/diagnostics/kt20062.kt

@@ -0,0 +1,20 @@
+package test
+
+import kotlinx.parcelize.*
+import android.os.*
+
+class Box(val value: String)
+
+@Parcelize
+class Foo(val box: Box): Parcelable {
+    companion object : Parceler<Foo> {
+        override fun create(parcel: Parcel) = Foo(Box(parcel.readString()))
+
+        override fun Foo.write(parcel: Parcel, flags: Int) {
+            parcel.writeString(box.value)
+        }
+    }
+}
+
+@Parcelize
+class Foo2(val box: <error descr="[PARCELABLE_TYPE_NOT_SUPPORTED] Type is not directly supported by 'Parcelize'. Annotate the parameter type with '@RawValue' if you want it to be serialized using 'writeValue()'">Box</error>): Parcelable