[REVIEW] Fix importing list & struct types in from_arrow

[galipremsagar]

Fixes: #7137, #7148

This PR fixes converting a pyarrow table which has llist and struct types via from_arrow. Incase of list dtype we shouldn't have to perform any typecast and incase of struct dtype we should be renaming the fields appropriately.

[rgsl888prabhu]

Looks good, have a small query. And need to update copyright year.

[codecov]

Codecov Report

Merging #7162 (1f79802) into branch-0.18 (8860baf) will increase coverage by 0.04%.
The diff coverage is 76.78%.

@@               Coverage Diff               @@
##           branch-0.18    #7162      +/-   ##
===============================================
+ Coverage        82.09%   82.14%   +0.04%     
===============================================
  Files               97       97              
  Lines            16474    16542      +68     
===============================================
+ Hits             13524    13588      +64     
- Misses            2950     2954       +4     

Impacted Files	Coverage Δ
python/cudf/cudf/core/column/lists.py	91.66% <ø> (-0.09%)	⬇️
python/cudf/cudf/core/dataframe.py	90.71% <50.00%> (+<0.01%)	⬆️
python/cudf/cudf/io/orc.py	86.80% <60.00%> (-1.61%)	⬇️
python/cudf/cudf/core/dtypes.py	89.50% <66.66%> (-0.88%)	⬇️
python/cudf/cudf/io/csv.py	90.74% <77.77%> (-2.60%)	⬇️
python/cudf/cudf/core/column/numerical.py	94.17% <80.00%> (-0.24%)	⬇️
python/cudf/cudf/core/series.py	91.10% <80.00%> (-0.06%)	⬇️
python/cudf/cudf/core/reshape.py	91.00% <81.81%> (-0.04%)	⬇️
python/cudf/cudf/core/column/string.py	86.65% <100.00%> (ø)
python/cudf/cudf/core/frame.py	90.01% <100.00%> (+0.03%)	⬆️
... and 7 more

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[rgsl888prabhu]

LGTM