slight simplifications of configs in favor of consistency

[AlexanderFengler]

This pull request removes the utility functions for model configuration from ssms/config/_modelconfig/utils.py and deletes their associated unit tests in tests/test_modelconfig_utils.py. This is a cleanup that eliminates unused or obsolete code related to model config utilities.

Removed model configuration utilities:

• Deleted the entire ssms/config/_modelconfig/utils.py file, which included _new_param, _get, and _new_config functions for constructing and managing model configuration dictionaries.

Removed related tests:

• Deleted the tests/test_modelconfig_utils.py file, which contained tests for the removed utility functions, including parameter creation, config structure, and error handling.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
unittests	90.92% <100.00%> (-0.16%)	⬇️

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Files with missing lines	Coverage Δ
ssms/config/_modelconfig/conflict.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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