Add option to ignore N812 for specific packages

[usamec]

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This typical ML idiom: import torch.nn.functional as F (see https://github.com/pytorch/examples/blob/main/mnist/main.py#L5)

gets flagged as: N812 Lowercase functional imported as non-lowercase 'F'

I would like to have an option to enable using this specific package without having to write noqa on every import line or disabling N812 entirely. Is it possible?

[saravanabalagi]

Also when using lightning, I get: N812 Lowercase lightning imported as non-lowercase L