iorap: Update AppLaunchEvent binder calls to use protobuf

* Also makes a minor change to android.os.Intent to allow writing it
into a protobuf without needing an outer field ID. This makes it
directly unserializable into a C++ code-generated protobuf as a root
proto.

Bug: 72170747
Change-Id: I19e91f0f9c5e5a37810a430e9c483e7752af54d7
Test: atest system/iorap