ISPN-3480 Use protoparser lib instead of relying on binary descriptors g...

...enerated by protoc

https://issues.jboss.org/browse/ISPN-3480

For review only, as it still depends on protostream 2.0.0-SNAPHOST

We should change this instead to take a proto string contents as a string, now that we can do dynamic parsing.  The URL was there only because we didn't have a nice way to upload the binary contents.

I would suggest changing the argument to be something like proto-contents or something like that.  Haven't though about a great name :)

But as you mentioned it may be worth it to have both options.