Make the JNI API to get list offsets as a view public.

[revans2]

This is an API I would like to use to help a customer with a UDF so I would like to make it public.

[codecov]

Codecov Report

Merging #10807 (71724af) into branch-22.06 (8d861ce) will increase coverage by 0.04%.
The diff coverage is 96.49%.

❗ Current head 71724af differs from pull request most recent head a456e49. Consider uploading reports for the commit a456e49 to get more accurate results

@@               Coverage Diff                @@
##           branch-22.06   #10807      +/-   ##
================================================
+ Coverage         86.40%   86.45%   +0.04%     
================================================
  Files               143      143              
  Lines             22448    22493      +45     
================================================
+ Hits              19396    19446      +50     
+ Misses             3052     3047       -5     

Impacted Files	Coverage Δ
python/cudf/cudf/core/indexed_frame.py	91.70% <ø> (ø)
python/cudf/cudf/core/dataframe.py	93.77% <96.29%> (+0.08%)	⬆️
python/cudf/cudf/testing/_utils.py	94.05% <100.00%> (+0.06%)	⬆️
python/cudf/cudf/core/column/string.py	89.21% <0.00%> (+0.12%)	⬆️
python/cudf/cudf/core/groupby/groupby.py	91.79% <0.00%> (+0.22%)	⬆️
python/cudf/cudf/core/column/numerical.py	96.17% <0.00%> (+0.29%)	⬆️
python/cudf/cudf/core/tools/datetimes.py	84.49% <0.00%> (+0.30%)	⬆️
python/cudf/cudf/core/column/lists.py	92.91% <0.00%> (+0.83%)	⬆️

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[revans2]

@gpucibot merge