Type hint IntegratorLearner

[basnijholt]

Description

Please include a summary of the change and which (if so) issue is fixed.

Fixes #(ISSUE_NUMBER_HERE)

Checklist

• Fixed style issues using pre-commit run --all (first install using pip install pre-commit)
• pytest passed

Type of change

Check relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• (Code) style fix or documentation update
• This change requires a documentation update

[codecov-commenter]

Codecov Report

Merging #372 (ae70ec8) into main (1b7e84d) will decrease coverage by 0.04%.
The diff coverage is 91.78%.

@@            Coverage Diff             @@
##             main     #372      +/-   ##
==========================================
- Coverage   77.67%   77.63%   -0.05%     
==========================================
  Files          37       37              
  Lines        5393     5401       +8     
  Branches      981      982       +1     
==========================================
+ Hits         4189     4193       +4     
- Misses       1058     1062       +4     
  Partials      146      146              

Impacted Files	Coverage Δ
adaptive/learner/integrator_learner.py	87.35% <87.50%> (-1.27%)	⬇️
adaptive/tests/algorithm_4.py	71.26% <96.29%> (+0.08%)	⬆️
adaptive/learner/integrator_coeffs.py	95.74% <100.00%> (+0.04%)	⬆️
adaptive/learner/average_learner1D.py	74.00% <0.00%> (-0.67%)	⬇️
adaptive/learner/learner1D.py	87.16% <0.00%> (-0.50%)	⬇️
adaptive/learner/learnerND.py	59.10% <0.00%> (+0.37%)	⬆️
adaptive/tests/test_cquad.py	92.25% <0.00%> (+0.64%)	⬆️
adaptive/runner.py	69.28% <0.00%> (+0.68%)	⬆️

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