Output codec without delimiter

[mihaitodor]

Looking at the available output codecs, I noticed that all-bytes truncates on each message and delim doesn't support an empty delimiter.

Would you consider removing the non-empty delimiter restriction in the delim output codec? I need this when using the chunker input codec that I added in #640 for the use case of transferring a large file from Azure to a local file.

[Jeffail]

Ahh of course, rather than allow empty delimiters it's probably better for discovery if we add an explicit append codec, that'll simply write the raw data.

Edit: but I'd also say it's fine to simply instantiate a delim codec with an empty delimiter under the hood to make the implementation simpler.

[mihaitodor]

append. Of course! I was struggling to figure out what to name it 😁 Coming right up!