Implement encoding for currently known CAMS fields

[tweska]

This PR implements encoding for fields mapped in ecmwf/multio#245

[codecov-commenter]

Codecov Report

❌ Patch coverage is 17.64706% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.34%. Comparing base (fa88f33) to head (4143b4c).

Files with missing lines	Patch %	Lines
...backend/concepts/composition/compositionEncoding.h	0.00%	7 Missing ⚠️
.../backend/concepts/composition/compositionMatcher.h	37.50%	5 Missing ⚠️
...it/mars2grib/backend/concepts/level/levelMatcher.h	0.00%	1 Missing ⚠️
...ackend/concepts/point-in-time/pointInTimeMatcher.h	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #184   +/-   ##
========================================
  Coverage    62.33%   62.34%           
========================================
  Files          303      302    -1     
  Lines        11601    11601           
  Branches      1036     1035    -1     
========================================
+ Hits          7232     7233    +1     
+ Misses        4369     4368    -1     

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[tweska]

I seem to have broken something with this PR. I'll keep this as draft until I figure out what.

It was a ) in the wrong position... :^/

[MircoValentiniECMWF]

I think we should have a proper deduction. If we start removing them because it is faster to implement then we can remove all of them. And then debugging will be an hell for everybody not super expert

[tweska]

Afaik we don't need constituentType in this concept because eccodes will set it when we set chemId (which we call chem). The deduction also doesn't seem to be correct, chem != constituentType according to this table: https://github.com/ecmwf/eccodes/blob/develop/definitions/grib2/chemId.def. I don't think we should use deductions for reading and returning mars keys without any more logic. This just increases complexity and makes debugging harder for us.