Refactor various indexing views

[alifahrri]

No description provided.

[alifahrri]

split constexpr test as separate executable

[codecov]

Codecov Report

Attention: Patch coverage is 93.57143% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 97.93%. Comparing base (b4b9a03) to head (00c29f4).

Files	Patch %	Lines
include/nmtools/array/index/moveaxis.hpp	66.66%	2 Missing ⚠️
include/nmtools/array/shape.hpp	75.00%	2 Missing ⚠️
include/nmtools/array/view/indexing.hpp	77.77%	2 Missing ⚠️
include/nmtools/array/view/reshape.hpp	95.45%	1 Missing ⚠️
include/nmtools/utils/isequal.hpp	85.71%	1 Missing ⚠️
include/nmtools/utl/either.hpp	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
+ Coverage   97.65%   97.93%   +0.28%     
==========================================
  Files         625      616       -9     
  Lines       12691    17729    +5038     
==========================================
+ Hits        12393    17363    +4970     
- Misses        298      366      +68     

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