Changes to data indices in anemoi models

[sahahner]

This PR brings the changes in anemoi-models to introduce the remapper into anemoi-training.

• In validation mode, the preprocessor needs to be applied out-of-place instead of in-place since the remapper changes the number of variables. Therefore, in the callbacks the preprocessor needs to be applied.
  • The impact on memory consumption and runtime as been thoroughly tested using the profiler. The results on mlflow show that the increase is not significant.
• Incorporate the changes to the data-indices into anemoi-training. After the preprocessor and before the preprocessor we need to use the internal set of indices now.
• Changes to config files
• Cycical colour maps are used to plot variables in degrees.

Some tests will fail because this PR depends on the following PR on anemoi-models: ecmwf/anemoi-models#21.
When this branch is checked out, all tests pass.

[FussyDuck]

All committers have signed the CLA.

[JesperDramsch]

LGTM