lottieparser: Stop parsing if the media type is unlikely to lottie.

lottieparser: Stop parsing if the media type is unlikely to lottie.

Users may need to try a load data in a brutal-force way,
if they have no idea of input source.

This case, they have no choices but try using all methods to find out
which loader successfully loaded among various media loaders.

This is a common scenario for compatible media support.