Numpy transforms

[LarsKue]

This PR

• removes the old LambdaTransform
• introduces a new NumpyTransform

This allows trivial serialization for the most common applications of the LambdaTransform.

[paul-buerkner]

Thank you! Looks good to me. Do we already have tests in place for this functionality? I also see that tests are failing. Is this because the LambdaTransform is still used in the tests?

[LarsKue]

@paul-buerkner updated with tests

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 93.02326% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
bayesflow/adapters/transforms/numpy_transform.py	90.62%	3 Missing ⚠️

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Files with missing lines	Coverage Δ
bayesflow/adapters/adapter.py	76.39% <100.00%> (ø)
bayesflow/adapters/transforms/__init__.py	100.00% <100.00%> (ø)
bayesflow/adapters/transforms/as_set.py	93.75% <100.00%> (+0.89%)	⬆️
bayesflow/adapters/transforms/as_time_series.py	93.75% <100.00%> (+0.89%)	⬆️
bayesflow/adapters/transforms/expand_dims.py	100.00% <100.00%> (ø)
bayesflow/adapters/transforms/filter_transform.py	61.16% <ø> (+5.92%)	⬆️
bayesflow/adapters/transforms/log.py	100.00% <100.00%> (ø)
bayesflow/adapters/transforms/sqrt.py	85.71% <100.00%> (+2.38%)	⬆️
bayesflow/adapters/transforms/to_array.py	83.33% <100.00%> (ø)
bayesflow/adapters/transforms/numpy_transform.py	90.62% <90.62%> (ø)

... and 2 files with indirect coverage changes

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[LarsKue]

@stefanradev93 I think the errors that came up in the CI are unrelated. Ready to merge from my side.