Disable creation of integral operators with inconsistent dimensions

[maltezfaria]

Fixes #98

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.07%. Comparing base (25beb1e) to head (e541735).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/domain.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #100       +/-   ##
===========================================
- Coverage   80.03%   66.07%   -13.97%     
===========================================
  Files          24       24               
  Lines        3025     3027        +2     
===========================================
- Hits         2421     2000      -421     
- Misses        604     1027      +423     

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