Add JNI for cudf::drop_duplicates

[ttnghia]

This adds Java binding for cudf::drop_duplicates.

Note that when choosing which duplicate element to keep, only KEEP_FIRST or KEEP_LAST option can be selected. In other words, this does not support KEEP_NONE to remove all duplicate elements.

Closes #9115.

[codecov]

Codecov Report

Merging #9841 (83ed4bf) into branch-22.02 (967a333) will decrease coverage by 0.04%.
The diff coverage is 5.79%.

@@               Coverage Diff                @@
##           branch-22.02    #9841      +/-   ##
================================================
- Coverage         10.49%   10.44%   -0.05%     
================================================
  Files               119      119              
  Lines             20305    20422     +117     
================================================
+ Hits               2130     2133       +3     
- Misses            18175    18289     +114     

Impacted Files	Coverage Δ
python/cudf/cudf/__init__.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/_base_index.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/column.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/string.py	0.00% <ø> (ø)
python/cudf/cudf/core/frame.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/groupby/groupby.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/index.py	0.00% <ø> (ø)
python/cudf/cudf/core/indexed_frame.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/multiindex.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/json.py	0.00% <ø> (ø)
... and 8 more

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[ttnghia]

@gpucibot merge