Add Downgrade CI

[fhagemann]

As more people keep contributing, it might make sense to update the lower bounds on the compats and to also include downgrade in the tests.

The use of ˋFunctionsChainsˋ requires the following minimal compats:

• ˋInverseFunctionsˋ 0.1.3 (to have ˋNoInverseˋ)
• ˋRequiresˋ 1.1
• ˋAdaptˋ 2.0.0

In addition, the following is needed for the tests to pass:

• ˋFillArraysˋ 0.8.4 to return waveforms of the correct types after appyling certain filters
• ˋArraysOfArraysˋ 0.5

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.66%. Comparing base (0141581) to head (dfe977d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   52.66%   52.66%           
=======================================
  Files          29       29           
  Lines         993      993           
=======================================
  Hits          523      523           
  Misses        470      470           

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[oschulz]

Thanks!