Remove support for `put_file_bytes` with an iterable of bytes or strings

[ysimonson]

put_file_bytes with an iterable of bytes or strings is deprecated, as any of the alternatives are more pythonic and likely more efficient. It should be remove eventually (perhaps coinciding with pachyderm core v2.0 release?):

https://github.com/pachyderm/python-pachyderm/blob/bbf2d2581e52b61722a88bd858bdebcc4ddbf1c5/src/python_pachyderm/mixin/pfs.py#L425-L439