Struct binary search (lower_bound/upper_bound)

[ttnghia]

This PR add support for lower_bound and upper_bound binary searchs for structs column. This closes #7690.

In addition to adding binary search for structs, I also did some refactoring for tests/search/search_test.cpp, extracting dictionary search test from it. As such, basic search tests, dictionary search tests and (the new) struct search tests are put in separate source files. This is easier to access and future maintainance.

[codecov]

Codecov Report

Merging #7865 (aaecd5f) into branch-0.20 (51336df) will increase coverage by 0.02%.
The diff coverage is 87.91%.

❗ Current head aaecd5f differs from pull request most recent head 4ba910a. Consider uploading reports for the commit 4ba910a to get more accurate results

@@               Coverage Diff               @@
##           branch-0.20    #7865      +/-   ##
===============================================
+ Coverage        82.88%   82.91%   +0.02%     
===============================================
  Files              103      103              
  Lines            17668    17655      -13     
===============================================
- Hits             14645    14638       -7     
+ Misses            3023     3017       -6     

Impacted Files	Coverage Δ
python/cudf/cudf/core/column/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/utils/cudautils.py	57.75% <25.00%> (ø)
python/cudf/cudf/core/column/column.py	88.64% <71.42%> (ø)
python/cudf/cudf/core/column/numerical.py	94.43% <72.72%> (ø)
python/cudf/cudf/core/dataframe.py	90.87% <83.33%> (+0.01%)	⬆️
python/cudf/cudf/utils/utils.py	89.53% <91.66%> (+0.02%)	⬆️
python/cudf/cudf/core/column/datetime.py	89.91% <100.00%> (ø)
python/cudf/cudf/core/column/timedelta.py	88.66% <100.00%> (ø)
python/cudf/cudf/core/groupby/groupby.py	92.28% <100.00%> (+0.83%)	⬆️
python/cudf/cudf/core/index.py	93.07% <100.00%> (ø)
... and 17 more

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[ttnghia]

Rerun tests.

[gerashegalov]

tests in Spark are passing NVIDIA/spark-rapids#2092 (comment)

[ttnghia]

@gpucibot merge

[kkraus14]

cmake lgtm