Draft: Read input streams in binary mode...

...but since all existing parsers expect strings, we also decode('utf8') in the StreamTimeseriesFactory wrapper factory prior to passing to the parser.

I'm doing this to fix an obscure bug when reading single files, but using the --input-url command line option, but also to satisfy the "best practice" that all file/url reads/writes should be in binary mode, even if internal processing expects strings. I was taught this "best practice" in a Teams chat with @jmfee on 12 May, 2022.