Add option to choose between NSYS and NCU profilers

[cosminc98]

• Add option to choose between NSYS and NCU profilers
• Fix isort and black issues
• Can search for profiling tool paths recursively in directories where they are expected to exist (if they do not exist in PATH)
• Documented changes

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 89.47368% with 6 lines in your changes missing coverage. Please review.

Project coverage is 92.57%. Comparing base (781ff5b) to head (3f8b89c).
Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
nvcc4jupyter/path_utils.py	87.50%	1 Missing and 2 partials ⚠️
nvcc4jupyter/plugin.py	90.00%	1 Missing and 1 partial ⚠️
nvcc4jupyter/parsers.py	91.66%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
- Coverage   94.19%   92.57%   -1.62%     
==========================================
  Files           3        4       +1     
  Lines         155      202      +47     
  Branches       21       32      +11     
==========================================
+ Hits          146      187      +41     
- Misses          5        8       +3     
- Partials        4        7       +3     

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[cosminc98]

@andreinechaev After reviewing the changes, please push the v1.2.0 tag (same reasoning: added features in a backward compatible manner so we bump the minor version).