feat: add epsilon computation to the main structure

[imrn99]

Summary

Add a new method to the main structure: Integraal::compute_error. This method computes the error one can expect from the approximation of the integral. Note that the value should be taken with a grain of salt since there is some derivative approximation involved.

Content

• Scope:
  • Code
• Type of change:
  • New feature(s)
• Necessary follow-up:
  • Needs testing: test should make use of this to adjust their tolerance

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 49 lines in your changes are missing coverage. Please review.

Project coverage is 78.04%. Comparing base (94392e5) to head (3ae9258).

Files	Patch %	Lines
integraal/src/structure/implementations.rs	0.00%	49 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##            trunk      #15       +/-   ##
===========================================
- Coverage   93.52%   78.04%   -15.49%     
===========================================
  Files           3        3               
  Lines         247      296       +49     
===========================================
  Hits          231      231               
- Misses         16       65       +49     

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