Improve performance: WritableStreamingData.writeBytes(ByteBuffer)

The `WritableStreamingData.writeBytes(ByteBuffer)` method is only optimal when the input `ByteBuffer.hasArray()` is true. Otherwise it delegates to the parent interface where the implementation runs a loop for each individual byte, which is slow.

Find a way to optimize the implementation for buffers that don't have arrays (perhaps using `Unsafe` methods or similar.)

For more details, see https://github.com/hashgraph/pbj/issues/191