Unignore and track ngram_counts.pkl.bz2 via LFS #22

Job	Run time
Test (3.12)	26s
deploy / Setup	4s
deploy / deploy-staging / build-aws / Build (staging)	19s
deploy / deploy-production	-1s
deploy / deploy-staging / build-gcp	-1s
deploy / deploy-staging / deploy-gcp-staging	0s
deploy / deploy-staging / deploy-staging-aws / Deploy (staging)	7s
	54s

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