Implement interleave_columns for list type

[ttnghia]

This PR implements lists::interleave_columns that returns a single column by interleaving rows of the given table of list elements.

For example:

s1 = [{0, 1}, {2, 3, 4}, {5}, {}, {6, 7}]
s2 = [{8}, {9}, {}, {10, 11, 12}, {13, 14, 15, 16}]
r = lists::interleave_columns( table_view{s1, s2} )
r is now [{0, 1}, {8}, {2, 3, 4}, {9}, {5}, {}, {}, {10, 11, 12}, {6, 7}, {13, 14, 15, 16}]

Currently, only lists columns of one depth level are supported.

[codecov]

Codecov Report

Merging #8046 (68180b5) into branch-0.20 (51336df) will increase coverage by 0.02%.
The diff coverage is 88.67%.

❗ Current head 68180b5 differs from pull request most recent head cca057c. Consider uploading reports for the commit cca057c to get more accurate results

@@               Coverage Diff               @@
##           branch-0.20    #8046      +/-   ##
===============================================
+ Coverage        82.88%   82.91%   +0.02%     
===============================================
  Files              103      103              
  Lines            17668    17865     +197     
===============================================
+ Hits             14645    14812     +167     
- Misses            3023     3053      +30     

Impacted Files	Coverage Δ
python/cudf/cudf/core/column/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/core/column/decimal.py	90.29% <ø> (-2.64%)	⬇️
python/cudf/cudf/core/column/interval.py	91.66% <ø> (+0.55%)	⬆️
python/cudf/cudf/core/column/lists.py	86.98% <ø> (-0.43%)	⬇️
python/cudf/cudf/core/column/numerical.py	94.72% <ø> (+0.29%)	⬆️
python/cudf/cudf/core/column/string.py	87.68% <ø> (+0.89%)	⬆️
python/cudf/cudf/core/column/struct.py	94.73% <ø> (-1.56%)	⬇️
python/cudf/cudf/core/column/timedelta.py	88.66% <ø> (ø)
python/cudf/cudf/core/dataframe.py	90.85% <ø> (+<0.01%)	⬆️
python/cudf/cudf/core/dtypes.py	94.95% <ø> (+1.14%)	⬆️
... and 45 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7bf6de6...cca057c. Read the comment docs.

[mythrocks]

Some minor changes requested. Good job on the tests.

[ttnghia]

@gpucibot merge