Support mapping of generic thrown exception types

[jkschneider]

What's changed?

Widened the type of JavaType.Method#thrownExceptions to JavaType to support the mapping of generic exceptions.

A method that throws a combination of a generic and non-generic exception looks like this:

interface Test {
   <T extends FileNotFoundException> void throwsGenericException() throws T, InterruptedException;
}

Its JVMS 4.3.4 signature is:

<T:Ljava/io/FileNotFoundException;>()V^TT;^Ljava/lang/InterruptedException;

What's your motivation?

Preparing the way for compile verification as a post-recipe task.

Anything in particular you'd like reviewers to focus on?

Should be LST deserialization compatible, but this is an ABI change and we should release workers and CLI ASAP. Old serialized LSTs will not have mapped generic exceptions correctly. They instead previously mapped the class bound (in the example above java.io.FileNotFoundException.

Checklist

• I've added unit tests to cover both positive and negative cases