Refactor more indexing views

[alifahrri]

No description provided.

[alifahrri]

refactor squeeze using indexing view

[alifahrri]

refactor expand_dims using indexing view

[alifahrri]

refactor ones, zeros to use full view

[alifahrri]

refactor slice to use indexing view

[alifahrri]

refactor flip using indexing view

[alifahrri]

refactor repeat using indexing view

[alifahrri]

add mutable_indexing support

[alifahrri]

refactor flatten to use reshape

[alifahrri]

update flip implementation to use slice

[alifahrri]

add mutable_reshape

[alifahrri]

refactor mutable_flatten using mutable_reshape

[alifahrri]

refactor mutable_slice using mutable_indexing

[codecov]

Codecov Report

Attention: Patch coverage is 96.89922% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 97.67%. Comparing base (63a3856) to head (9761101).

Files	Patch %	Lines
include/nmtools/utl/vector.hpp	77.77%	2 Missing ⚠️
include/nmtools/array/view/mutable_indexing.hpp	92.85%	1 Missing ⚠️
include/nmtools/array/view/ufunc/reduce.hpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #276      +/-   ##
==========================================
- Coverage   97.93%   97.67%   -0.26%     
==========================================
  Files         616      606      -10     
  Lines       17729    15890    -1839     
==========================================
- Hits        17363    15521    -1842     
- Misses        366      369       +3     

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