compression level validation

[aryszka]

Describe the bug
The documentation states that the valid levels for the compress filter are [0..9], while the validation logic allows a wider range, see: #1515

Expected behavior
The safest is to limit the validation to 0..9, and explicitly support HuffmanOnly, and use the default when the compression level is not specified.

Observed behavior
Currently the validation accepts a wider range of levels than what's documented.