Model Comparison

[LarsKue]

This branch implements:

1. A better way to implement new architectures as compared to streamlined-backend
2. An architecture for Model Comparison
3. Modularized Data Adapters (previously Configurators)
   3.1. These are now moved into the datasets, allowing this code to be run in a worker process
4. Fully CPU simulation with numpy, improving compatibility of GPU setups with multiprocessing (to be fixed upstream by keras)
5. Easier creation of online datasets and some smart defaults for training parameters (e.g. batch size)
6. Improved logging utilities and some general clean-ups

There are some drawbacks:

1. Since data adapters are now generalized instead of specific to each architecture, there is no longer a way to override individual variable configuration
2. Data adapters must be explicitly created by the user (but this is a simple one-liner)
3. The sample and log_prob methods are not yet finished (this is WIP)

This got much bigger than I had anticipated originally, so please just take a general look in your reviews and we can set a meeting to discuss in more detail 😄

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Codecov Report

Attention: Patch coverage is 57.69231% with 385 lines in your changes missing coverage. Please review.

Please upload report for BASE (streamlined-backend@b4afea0). Learn more about missing BASE report.

Files	Patch %	Lines
bayesflow/utils/optimal_transport/sinkhorn.py	16.90%	59 Missing ⚠️
...low/approximators/model_comparison_approximator.py	30.37%	55 Missing ⚠️
bayesflow/approximators/continuous_approximator.py	60.97%	32 Missing ⚠️
bayesflow/simulators/model_comparison_simulator.py	21.95%	32 Missing ⚠️
bayesflow/utils/dict_utils.py	22.85%	27 Missing ⚠️
bayesflow/utils/io.py	6.89%	27 Missing ⚠️
bayesflow/approximators/approximator.py	59.52%	17 Missing ⚠️
bayesflow/simulators/simulator.py	25.00%	15 Missing ⚠️
...esflow/data_adapters/flow_matching_data_adapter.py	46.15%	14 Missing ⚠️
bayesflow/datasets/rounds_dataset.py	23.52%	13 Missing ⚠️
... and 22 more

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Additional details and impacted files

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##             streamlined-backend     #184   +/-   ##
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  Coverage                       ?   59.32%           
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  Files                          ?      117           
  Lines                          ?     2532           
  Branches                       ?        0           
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  Hits                           ?     1502           
  Misses                         ?     1030           
  Partials                       ?        0           

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