124 add lampe

[maho3]

This PR addresses #124 . It consists of the following changes:

• Adds lampe dependencies to setup.cfg and INSTALL.md
• Adds LampeRunner in ili/inference/runner_lampe.py, with a configuration similar to the pydelfi and sbi runners. It only does NPE (no SNPE), but can use a wide variety of flows from zuko.
• Adds LampeNPE and LampeEnsemble to ili/utils/ndes_pt.py, to mirror similar NDE implementations in sbi (with sampling methods and weighting etc.)
• Adds TorchLoader to ili/dataloaders. This allows one to simply give LampeRunner custom train/val torch Dataloaders, which is necessary in the GNN example.
• Adds lampe.ipynb in notebooks to demonstrate application. This includes integration with a pytorch_geomentric graph neural network for embeddings.

Still todo:

• [x] Make a configuration-based lampe example
• [x] Cleanup comments
• [x] Add other zuko NDEs
• [x] Add proposal/prior weighting
• [x] ValidationRunner is hardcoded for old Loaders. Make it work for TorchLoader
• [x] Check GPU functionality
• [x] Add tests (Following PR #121)
• [x] Cleanup lampe.ipynb and have it only demonstrate the GNN integration.
• [x] Add documentation to CONFIG.md

[codecov-commenter]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (f1e8b80) 97.27% compared to head (42208b1) 96.49%. Report is 1 commits behind head on main.

Files	Patch %	Lines
ili/utils/ndes_pt.py	93.33%	9 Missing :warning:
ili/dataloaders/loaders.py	73.68%	5 Missing :warning:
ili/inference/runner_lampe.py	97.48%	4 Missing :warning:
ili/inference/runner_pydelfi.py	33.33%	2 Missing :warning:
ili/utils/samplers.py	80.00%	2 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #125 +/- ## ========================================== - Coverage 97.27% 96.49% -0.79% ========================================== Files 22 23 +1 Lines 1249 1597 +348 ========================================== + Hits 1215 1541 +326 - Misses 34 56 +22 ```

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