[issue34969] Add --fast, --best to the gzip CLI

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

If we add this options to the gzip CLI, I would suggest to add them to bzip2 and lzma CLI in the same PR. And maybe open separate issues for the zipfile and tarfile CLI,

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<https://bugs.python.org/issue34969>
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