Convert reduction to array

[Bchass]

Description

Resolves: #470

Changes

• Convert identity(matrix by default) to an array with to.array()

Checklist

• Use ruff and pylint for errors related to code style and formatting.
• Verify all previous and newly added unit tests pass in pytest.
• Check the documentation build does not lead to any failures. Sphinx build can be checked locally for any failures related to your PR
• Use linkcheck to check for broken links in the documentation
• Use doctest to verify the examples in the function docstrings work as expected.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.1%. Comparing base (c44a3c7) to head (8a057cf).

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #495   +/-   ##
======================================
  Coverage    98.1%   98.1%           
======================================
  Files         161     161           
  Lines        3095    3096    +1     
  Branches      752     752           
======================================
+ Hits         3037    3038    +1     
  Misses         37      37           
  Partials       21      21           

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[vprusso]

LGTM!