Prepare retreat

[MaxBlesch]

This PR prepares the DCEGM retreat. There are mainly three things we want to fix.

• Rewrite model_sim keyword to alt_model_funcs
• Move to params, model_specs (options["model_params"] before) and model_config (options["state_space"] before)
• Introduce classes for the interface.

The first changes are directly developed here. The second and third will have their own PR with this branch as base branch.

[codecov]

Codecov Report

❌ Patch coverage is 98.33611% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.86%. Comparing base (10ddc4f) to head (68d46f2).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dcegm/pre_processing/check_options.py	92.75%	5 Missing ⚠️
src/dcegm/pre_processing/batches/batch_creation.py	77.77%	2 Missing ⚠️
src/dcegm/interfaces/sol_interface.py	95.00%	1 Missing ⚠️
.../dcegm/pre_processing/alternative_sim_functions.py	96.55%	1 Missing ⚠️
...oy_models/example_params_model_specs_and_config.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #162      +/-   ##
==========================================
+ Coverage   94.18%   95.86%   +1.68%     
==========================================
  Files          60       68       +8     
  Lines        1633     1766     +133     
==========================================
+ Hits         1538     1693     +155     
+ Misses         95       73      -22     

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