Interpolate action with proper config parsing and additional metadata support

[pgeier]

Description

Alternative PR to handle additional metadata in a strict way. Currently only the keyword "resolution" is allowed.
The action has been reworked to support proper config parsing (util/config). Due to the fact that options are forwarded to MIR, some more caveats have to be taken into account:

There is an option called "options" which contains a LocalConfiguration that is completely forwarded to MIR - this passing through anything which is against the reasons why the config parser was added (to be more specific, which is the reason why the the other PR is discouraged).

On the other hand, the metkit language yaml was loaded and all postprocs keywords are also supported as option. To combine these with the stricter option struct, a typed list of these keywards where copied, yet without validation contents.

Both approaches have their caveats and are redundant to each other - a proper decision should be taken how the action config should be cleaned up.

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.

🌈🌦️📖🚧 Documentation 🚧📖🌦️🌈
https://sites.ecmwf.int/docs/dev-section/multio/pull-requests/PR-263

[codecov-commenter]

Codecov Report

❌ Patch coverage is 53.44828% with 108 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.11%. Comparing base (ca206b5) to head (f494fa9).

Files with missing lines	Patch %	Lines
src/multio/util/config/detail/Parser.cc	16.12%	52 Missing ⚠️
src/multio/action/interpolate/Interpolate.cc	65.71%	48 Missing ⚠️
src/multio/util/config/detail/Parser.h	55.55%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #263      +/-   ##
===========================================
- Coverage    56.26%   56.11%   -0.16%     
===========================================
  Files          323      322       -1     
  Lines        21140    21219      +79     
  Branches      1687     1695       +8     
===========================================
+ Hits         11894    11906      +12     
- Misses        9246     9313      +67     

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