Parcelize: Add the Parcelize compiler plugin with sources extracted from Android Extensions plugin (KT-40030)

plugins/parcelize/parcelize-compiler/testData/box/charSequence.kt

@@ -0,0 +1,26 @@
+// WITH_RUNTIME
+
+@file:JvmName("TestKt")
+package test
+
+import kotlinx.parcelize.*
+import android.os.Parcel
+import android.os.Parcelable
+import android.text.SpannableString
+
+@Parcelize
+data class Test(val simple: CharSequence, val spanned: CharSequence) : Parcelable
+
+fun box() = parcelTest { parcel ->
+    val test = Test("John", SpannableString("Smith"))
+    test.writeToParcel(parcel, 0)
+
+    val bytes = parcel.marshall()
+    parcel.unmarshall(bytes, 0, bytes.size)
+    parcel.setDataPosition(0)
+
+    val test2 = readFromParcel<Test>(parcel)
+
+    assert(test.simple.toString() == test2.simple.toString())
+    assert(test.spanned.toString() == test2.spanned.toString())
+}