Add hydra entrypoint

[rayg1234]

This adds a separate entrypoint to use hydra configs and eventually replace the current fairchem configs. More info here.

Additions

• A new cli that is similiar to the old cli but shares the same flags and can be activated for now using the --hydra option.
• A new abstract runner that allows any runner to be runner (previously, it fixed to the old trainer class which forces us to put all things train, eval, relaxations etc under the trainer). Having separate "runners" will allow us to separately implement trainers, evaluators etc.
• slight modernization to how the cuda devices are initialized to support the new cli/runner
• a test runner that can be initialized using hydra
• Slight modification of the relaxation code so that its less tied to the ocp trainer
• Separate PR that shows an implementation of the relaxation runner using this new cli/runner combo.

To run local:
fairchem --config-yml=src/fairchem/experimental/foundation_models/evaluation/matbench_discovery/matbench_example.ymll --hydra

To run on slurm:
fairchem --config-yml=src/fairchem/experimental/foundation_models/evaluation/matbench_discovery/matbench_example.ymll --hydra --submit --num-gpus=8

TODO in separate PR:

• add WB logger, probably need singleton logger to avoid abusing the main config

[codecov]

Codecov Report

Attention: Patch coverage is 74.01575% with 33 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/fairchem/core/_cli_hydra.py	75.00%	16 Missing ⚠️
src/fairchem/core/common/distutils.py	53.84%	12 Missing ⚠️
src/fairchem/core/components/runner.py	84.00%	4 Missing ⚠️
...m/core/common/relaxation/optimizers/lbfgs_torch.py	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/fairchem/core/_cli.py	68.11% <100.00%> (ø)
src/fairchem/core/common/flags.py	100.00% <100.00%> (ø)
src/fairchem/core/common/utils.py	68.75% <100.00%> (+0.18%)	⬆️
...m/core/common/relaxation/optimizers/lbfgs_torch.py	15.75% <0.00%> (ø)
src/fairchem/core/components/runner.py	84.00% <84.00%> (ø)
src/fairchem/core/common/distutils.py	56.55% <53.84%> (+1.35%)	⬆️
src/fairchem/core/_cli_hydra.py	75.00% <75.00%> (ø)

... and 2 files with indirect coverage changes

[misko]

LGTM!