Implement XML decoding for DYNAMIC_ATTRIBUTE resource type

[Col-E]

There is no reference implementation and I've not seen a dynamic attribute being used in a real-world app, so I'm not sure what its supposed to look like. Thus, the decoding for these resource types is not yet implemented and is stubbed out with the default @res/<id>

Relevant code: https://github.com/Col-E/binary-resources/blob/master/src/main/java/software/coley/android/xml/XmlDecoder.java#L268