refactor!: replace f64 by generics

[imrn99]

Summary

Add three new traits that are automatically implemented for all types fitting their requirements: DomainScalar, ImageScalar and ImageScalar. They differ in requirements (those are entirely defined by the necessity for implementation) and are distinguished by some vague notion of homogeneity.

To-Do:

• Rewrite tests to cover f64, f32, and mixed type integrals will do in another PR where I complete tests
• Correct the almost_equal macros (ref)

Content

• Scope:
  • Code
• Type of change:
  • Refactor
• Other:
  • Breaking change
  • New dependency: num

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.65217% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 93.52%. Comparing base (602f0aa) to head (ec03931).

Files	Patch %	Lines
integraal/src/structure/tests.rs	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk      #13   +/-   ##
=======================================
  Coverage   93.52%   93.52%           
=======================================
  Files           3        3           
  Lines         247      247           
=======================================
  Hits          231      231           
  Misses         16       16           

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