ECC-2046: GRIB2: typeOfLevel for heigthAboveGroundAt 0,2,10 metres

[rdosinski]

Please merge the branch into develop. It extends the typeOfLevel concept by three additional entries for height above ground at 0, 2 1na 10 metres. This is because the typeOfLevel heigthAboveGround is associated in MARS with either levtype sfc or hl.
levtype hl are normally only height > 10 metres and heights <= 10 metres remain sfc.

See https://jira.ecmwf.int/browse/ECC-2046

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.59%. Comparing base (b8c4bcb) to head (d0fc36c).
Report is 25 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #303   +/-   ##
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  Coverage    87.59%   87.59%           
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  Files          843      843           
  Lines        62282    62282           
  Branches     11124    11124           
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  Hits         54553    54553           
  Misses        7729     7729           

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