Support processing InputStream in KlvParser

[ruckc]

What is the use case for your proposed feature? Please describe.
I am attempting to parse (in near real time) a KLV bytestream coming out of an external ffmpeg process. I'd like to parse the InputStream directly with KlvParser without needing to figure out the message lengths myself.

Describe the solution you'd like
Add a KlvParser.parseStream(InputStream is) method.

Describe alternatives you've considered
Given the unknown aspect of message lengths, and that KlvParser.parseBytes doesn't tell me how many bytes have been read, I'd have to implement my own stream processing logic, and feed the byte[] into parseBytes().