Add create from generator

[jaclark5]

Description

Currently creating a dataset involves a list[dict] that is imported all at once into descent.targets.energy.create_dataset(). This requires that the entire dataset is held in memory.

HuggingFace dataset can be created with generators using Dataset.from_generator() but the Dataset is abstracted away in descent.

This PR adds a function descent.targets.energy.create_dataset_from_generator() to regain this capability from the datasets library.

Marking as a draft until I successfully use this with my current work, just in case I run into an issue

Status

• Ready to go

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.49%. Comparing base (40d4051) to head (3ab21eb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   99.49%   99.49%           
=======================================
  Files          11       11           
  Lines         981      997   +16     
=======================================
+ Hits          976      992   +16     
  Misses          5        5           

Flag	Coverage Δ
unittests	99.49% <100.00%> (+<0.01%)	⬆️

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