Migrate nvtext generate_ngrams APIs to pylibcudf #16768

Job	Run time
checks / check-style	2m 50s
devcontainer / build (amd64, 12.5, conda)	13m 50s
changed-files / Check changed files	19s
checks / other-checks	59s
devcontainer / build (amd64, 12.5, pip)	13m 18s
wheel-build-libcudf	0s
static-configure	0s
conda-cpp-build	0s
wheel-build-pylibcudf	0s
conda-cpp-tests	0s
conda-cpp-checks	0s
conda-python-build	0s
conda-java-tests	0s
wheel-build-cudf-polars	0s
wheel-build-cudf	0s
conda-notebook-tests	0s
conda-python-other-tests	0s
conda-python-cudf-tests	0s
docs-build	0s
cudf-polars-polars-tests	0s
wheel-tests-cudf-polars	0s
wheel-build-dask-cudf	0s
wheel-tests-cudf	0s
pandas-tests	0s
unit-tests-cudf-pandas	0s
wheel-tests-dask-cudf	0s
pandas-tests-diff	0s
pr-builder / run	1s
	31m 17s

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