remove language_modeling (cherry-pick of #14192)

[dimapihtar]

• remove language_modeling

• fix imports

• fix imports

• Apply isort and black reformatting

• fix style

• fix style

• fix import

• fix imports

• Apply isort and black reformatting

• fix style

• fix style

• fix style

• remove multimodal data unit tests

• remove nlp

• remove import checks for nlp

• Apply isort and black reformatting

• remove check imposrts for nlp

• remove check imports for nlp

• fix nlp imports

• Apply isort and black reformatting

• guard imports

• Apply isort and black reformatting

• fix style

• move MegatronPretrainingBatchSampler

• Apply isort and black reformatting

• fix import

• Apply isort and black reformatting

• fix style

• Apply isort and black reformatting

• fix style

• fix style

• fix import

• Apply isort and black reformatting

• fix imports

• Apply isort and black reformatting

• fix import

• Apply isort and black reformatting

• fix style

• remove multimodal test

• fix import

• Apply isort and black reformatting

• remove files

• resolve merge conflicts

• revert changes

• fix nlp data imports

• Apply isort and black reformatting

• fix style

• Apply isort and black reformatting

• fix style

• move list_available_models to nlp.modules

• Apply isort and black reformatting

• get rid of language modelling modules

• Apply isort and black reformatting

• fix style

• add Makefile

• add Makefile

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