Implement groundwater coupling changes in BMI

[BSchilperoort]

Testable with the executable file from the main branch of STEMMUS_SCOPE.

I also reworked the bmi variable definitions to reduce duplication. It now uses a dataclass BmiVariable.

[BSchilperoort]

All new variables for the groundwater coupling have been implemented. Should work in theory, but still needs to be double checked with a new docker image.

In a subsequent PR, the variables in this table can be added.

[review-notebook-app]

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
82.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[SarahAlidoost]

@BSchilperoort thanks 👍 I was able to run the notebook for a few time steps with the new exe file in EcoExtreML/STEMMUS_SCOPE#239. Just some minor comments and the linter errors below.

[BSchilperoort]

I've incorporated your comments @SarahAlidoost . Once the 1.6.0 stemmus_scope image is on the container registry, this PR can be finished up.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
86.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud