Add dt_min option for IDAKLUSolver

[MarcBerliner]

Description

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python -m pytest (or $ nox -s tests)
• The documentation builds: $ python -m pytest --doctest-plus src (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ nox -s quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[kratman]

Tagging my PR so I make sure to include these changes #4487

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.24%. Comparing base (a7253b8) to head (c44ef14).
Report is 135 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4736      +/-   ##
===========================================
+ Coverage    99.22%   99.24%   +0.01%     
===========================================
  Files          303      303              
  Lines        23070    23242     +172     
===========================================
+ Hits         22891    23066     +175     
+ Misses         179      176       -3     

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