Java: BinaryDecoder lacks checks on bytes array length

There are several checks on string length in BinaryDecoder. However, it lacks the same checks for byte arrays.

• Negative lengths lead to IllegalArgumentException instead of org.apache.avro.AvroRuntimeException
• Pathologically large (however legal) arrays can be allocated. Some applications will be suffer denial of service if they are forced to allocate 1 GB arrays repeatedly.