OCPCalculator to FAIRChemCalculator

[HabibOmar]

Changed all occurrences of OCPCalculator to FAIRChemCalculator.

[lbluque]

Thanks @HabibOmar, if you can change imports to use the convenience import from fairchem.core import FAIRChemCalculator were applicable that would be great!

[HabibOmar]

Hi @lbluque,

I have addressed the requested changes and resolved the conversation. Please review the updates when you have a chance and let me know if there is something else that needs to be changed.

Thank you!

[mshuaibii]

Hi @HabibOmar

Thanks for this. It would be nice to add backwards compatibility for OCPCalculator. Something like this is what I had in mind - we did this when we renamed all our dataset classes. This should also help resolve the failing tests.

fairchem/src/fairchem/core/datasets/lmdb_dataset.py

Lines 227 to 234 in 5743a59

	class TrajectoryLmdbDataset(LmdbDataset[BaseData]):
	def __init__(self, config, transform=None) -> None:
	super().__init__(config)
	warnings.warn(
	"TrajectoryLmdbDataset is deprecated and will be removed in the future."
	"Please use 'LmdbDataset' instead.",
	stacklevel=3,
	)

We can deprecate this in a future release once more people are familiar with the transition.

Also - FAIRChemCalculator is quite verbose and I'm open to alternatives :)