Receive UDP packets

Hi

I have an issue receiving UDP packets. The problem seems to be with codec, either requiring a newline or some other delimiter to actually create a message. I just need a packet boundary (one packet = one message) and 'codec: all-bytes' does not do that either for me. I am not sure how to proceed on this. Any ideas?

If ok I could make a PR and try either rewrite the code and try fix this. I can also look into adding metadata as mentioned in #327 at the same time.

My config. As UDP sender I can use nc -w 0 -u 127.0.0.1 5000 < myfile.

input:
  socket_server:
    network: udp
    address: 0.0.0.0:5000

pipeline:
  processors: []

output:
  type: stdout```