WIP: Add learner1D.all_intervals_between

[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 #390 (7509363) into main (6c69e88) will decrease coverage by 0.29%.
The diff coverage is 7.69%.

@@            Coverage Diff             @@
##             main     #390      +/-   ##
==========================================
- Coverage   78.08%   77.78%   -0.30%     
==========================================
  Files          37       37              
  Lines        5525     5538      +13     
  Branches      989      994       +5     
==========================================
- Hits         4314     4308       -6     
- Misses       1064     1078      +14     
- Partials      147      152       +5     

Impacted Files	Coverage Δ
adaptive/learner/learner1D.py	85.23% <7.69%> (-2.48%)	⬇️
adaptive/_version.py	45.61% <0.00%> (-3.51%)	⬇️
adaptive/learner/average_learner1D.py	73.75% <0.00%> (-1.00%)	⬇️

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