Rework contains_scalar to check nulls at runtime

[davidwendt]

Description

Rework the contains_scalar function to check nulls at runtime and reduce the amount of generated code.
The contains_scalar.cu compile time increased dramatically recently:
https://gpuci.gpuopenanalytics.com/job/rapidsai/job/gpuci/job/cudf/job/prb/job/cudf-cpu-cuda-build/CUDA=11.5/11743/Build_20Metrics_20Report/

The change here is expected to improve compile time significantly. The nvbench-mark showed no changes to performance.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[davidwendt]

Looks like compile time may be reduced from 27m to 12m
https://gpuci.gpuopenanalytics.com/job/rapidsai/job/gpuci/job/cudf/job/prb/job/cudf-cpu-cuda-build/CUDA=11.5/11762/Build_20Metrics_20Report/

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (branch-22.10@a7b2e0c). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff               @@
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[ttnghia]

This is great.

[davidwendt]

@gpucibot merge