Log generation parameters and allow loading cached dataset without all splits

[aakashdp6548]

1. Logs config used at generation time to generated data folder for reference
2. Move asserts checking that all splits are present out of CachedSimulatedDataset constructor and into individual dataloader functions. This allows for having separate datasets used for training/testing, e.g. generating training data with certain params and test data with other params.

# no errors
train_only_dataset = instantiate(cfg.cached_simulator, cached_data_path="path/to/train/data")
test_only_dataset = instantiate(cfg.cached_simulator, cached_data_path="path/to/test/data")

trainer.fit(encoder, datamodule=train_only_dataset)
trainer.test(encoder, datamodule=test_only_dataset)

# AssertionError: no cached data found
trainer.fit(encoder, datamodule=test_only_dataset)
trainer.test(encoder, datamodule=train_only_dataset)

[codecov]

Codecov Report

Merging #765 (b52d6af) into master (760e909) will decrease coverage by 0.03%.
The diff coverage is 93.33%.

❗ Current head b52d6af differs from pull request most recent head c4e7820. Consider uploading reports for the commit c4e7820 to get more accurate results

@@            Coverage Diff             @@
##           master     #765      +/-   ##
==========================================
- Coverage   88.75%   88.73%   -0.03%     
==========================================
  Files          14       14              
  Lines        1254     1260       +6     
==========================================
+ Hits         1113     1118       +5     
- Misses        141      142       +1     

Flag	Coverage Δ
unittests	88.73% <93.33%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
bliss/simulator/simulated_dataset.py	88.88% <91.66%> (-0.59%)	⬇️
bliss/generate.py	98.57% <100.00%> (+0.04%)	⬆️

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[zhixiangteoh]

Looks good, thanks!