add file_patterns in file_types with resolution type for satpy_cf_nc reader

[TAlonglong]

If a instrument provide different spatial resolution, like viirs with M, I and DN Bands this can be stored in one file per resolution type.
This PR adds a file_pattern to match this.

[mraspaud]

LGTM, I'm good with that.

[codecov]

Codecov Report

Merging #1597 (9228892) into master (c74c396) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1597   +/-   ##
=======================================
  Coverage   92.66%   92.66%           
=======================================
  Files         253      253           
  Lines       37199    37199           
=======================================
  Hits        34470    34470           
  Misses       2729     2729           

Flag	Coverage Δ
behaviourtests	4.78% <ø> (ø)
unittests	92.80% <ø> (ø)

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