allow using quantities in linspace step

[seb5g]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 73.59%. Comparing base (9ae6443) to head (9b9772c).
Report is 2 commits behind head on 0.0.x_dev.

Files with missing lines	Patch %	Lines
src/pymodaq_utils/math_utils.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           0.0.x_dev      #43   +/-   ##
==========================================
  Coverage      73.59%   73.59%           
==========================================
  Files             18       18           
  Lines           1598     1602    +4     
==========================================
+ Hits            1176     1179    +3     
- Misses           422      423    +1     

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