[REVIEW] Fix error in cudf.to_numeric when a bool input is passed

[galipremsagar]

Fixes: #10049

This PR fixes an incorrect error being displayed when cudf.to_numeric is called by passing an input with bool dtype. Technically bool is the lowest dtype size possible in numpy so this is a no-op because to_numeric is aimed at downcasting inputs.

[codecov]

Codecov Report

Merging #10431 (c4d8503) into branch-22.04 (4596244) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@               Coverage Diff                @@
##           branch-22.04   #10431      +/-   ##
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+ Coverage         86.13%   86.16%   +0.02%     
================================================
  Files               139      139              
  Lines             22438    22439       +1     
================================================
+ Hits              19328    19334       +6     
+ Misses             3110     3105       -5     

Impacted Files	Coverage Δ
python/cudf/cudf/core/tools/numeric.py	89.24% <100.00%> (+0.11%)	⬆️
python/cudf/cudf/core/column/string.py	88.39% <0.00%> (+0.12%)	⬆️
python/cudf/cudf/core/groupby/groupby.py	91.57% <0.00%> (+0.22%)	⬆️
python/cudf/cudf/core/column/numerical.py	95.28% <0.00%> (+0.29%)	⬆️
python/cudf/cudf/core/tools/datetimes.py	84.49% <0.00%> (+0.30%)	⬆️
python/cudf/cudf/core/column/lists.py	90.56% <0.00%> (+0.47%)	⬆️

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[vyasr]

This looks much cleaner. It does mean reconstructing the list any time cudf.to_numeric is called with downcast=True, but I'm fine with that.

[galipremsagar]

@gpucibot merge