Feature/metk 167 alternative paramids

[danovaro]

Description

not ready for merge

• pre-compute paramids & shortname contextes & store in a binary file.

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.

📋 Metkit Documentation 📋
https://sites.ecmwf.int/docs/metkit/pull-requests/PR-253

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.17730% with 70 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.22%. Comparing base (df167e0) to head (c43a549).

Files with missing lines	Patch %	Lines
src/metkit/mars/TypeParam.cc	73.66%	64 Missing ⚠️
tests/test_expand.cc	57.14%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #253      +/-   ##
===========================================
+ Coverage    50.95%   51.22%   +0.27%     
===========================================
  Files          384      385       +1     
  Lines        15467    15675     +208     
  Branches      1310     1334      +24     
===========================================
+ Hits          7881     8030     +149     
- Misses        7586     7645      +59     

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