Feature/update faer 0.21

[geo-ant]

This adds support for faer-rs version 0.21.x, while keeping the previously added support for version 0.20. I realize, this looks like a daunting PR again in terms of lines changed, but it's actually not as bad. Since faer underwent a big rewrite between the versions, I had to factor out the actual implementations of the argmin-math traits into different modules and conditionally compile them. However, I also factored out the tests from the old faer_m module, which is now renamed to faer_m_0_20, to a common faer_test module. The tests were just factored out into this module, no changes were made to the tests*. That means the implementations for both faer backends pass the same, unaltered test suite.

In summary:

• I renamed faer_m (and it's submodules to) faer_m_0_20
• I factored out the tests in the submodules to faer_test
• I added faer_m_0_21 for implementations in the 0.21 dependency

I hope newer faer versions will introduce less breaking changes for the fundamental operations we're using here, so that it won't be necessary to introduce faer_m_x_xx again. But even if not, this is reasonably simple to do.

(*) except at one place where I had to introduce a matrix_element_at helper function to access a matrix element across faer versions. But this is not a semantic change.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.10%. Comparing base (4728080) to head (9246d03).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #575      +/-   ##
==========================================
- Coverage   92.10%   92.10%   -0.01%     
==========================================
  Files         177      177              
  Lines       23675    23675              
==========================================
- Hits        21807    21806       -1     
- Misses       1868     1869       +1     

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[geo-ant]

urgh, the failing CI is related to #574 , which is about the paste crate being unmaintained as of recently.

[stefan-k]

Thanks for this PR, it's great to have the most recent version supported as well! :)

urgh, the failing CI is related to #574 , which is about the paste crate being unmaintained as of recently.

"urgh" is the perfect noise for this. About 90% of the time I have available for argmin is spent on things like this ;) It should be fixed in main after merging #576

[geo-ant]

Thanks for this PR, it's great to have the most recent version supported as well! :)

urgh, the failing CI is related to #574 , which is about the paste crate being unmaintained as of recently.

"urgh" is the perfect noise for this. About 90% of the time I have available for argmin is spent on things like this ;) It should be fixed in main after merging #576

I feel you, and I hope you didn't take it as an insult to you. You have your CI set up really professionally, I'm going to take a page of your playbook for my projects at some point.

[stefan-k]

I feel you, and I hope you didn't take it as an insult to you.

No no, not at all. I just felt like venting a little :D

You have your CI set up really professionally, I'm going to take a page of your playbook for my projects at some point.

Thanks and feel free to do so. Don't be surprised if you find a mess in certain corners ;)