ECC-2282: Feature/hydrology c3s

[rdosinski]

Description

This PR is to adapt the MARS namespace for C3S hydrology data, classes gh and eh. In the current implementation for class gh and class eh, stattype was always available and aliased into the mars namespace. It is only needed for streams msmm and rfsd. The original stream mmsf is for sub-daily and daily parameters, so mmsf must be changed to msmm which contains the monthly averages. step and fcmonth is not needed in stream rfsd, the statistics are described using stattype and timespan.

The local section 12 and 16 contain already the meta key marsForecastMonth, so it only needs to be recalculated for local sections other than 12 and 16.

Please merge this branch into develop for the future 2.48.0 release. Please also cherry-pick the following commits into hotfix/2.47.2:

d65af02
36213d4
ba3dc09

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.16%. Comparing base (fa764a8) to head (5b5ee8b).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #496   +/-   ##
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  Coverage    88.16%   88.16%           
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  Files          854      854           
  Lines        63582    63582           
  Branches     11301    11301           
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  Hits         56056    56056           
  Misses        7526     7526           

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