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

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

man lzma:

       --fast
       --best These are somewhat misleading aliases for  -0  and  -9,  respec‐
              tively.   These  are  provided  only for backwards compatibility
              with LZMA Utils.  Avoid using these options.

man bzip2:

       -1 (or --fast) to -9 (or --best)
              Set  the  block size to 100 k, 200 k ..  900 k when compressing.
              Has no effect when decompressing.  See MEMORY MANAGEMENT  below.
              The --fast and --best aliases are primarily for GNU gzip compat‐
              ibility.  In particular, --fast  doesn't  make  things  signifi‐
              cantly faster.  And --best merely selects the default behaviour.

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