Deprecate ListUtil and Fields classes

[andreisilviudragnea]

• Deprecated ListUtil class in favor of Java 8 Streams
• Deprecated unused Fields class

Relates to #1926.

[codecov-commenter]

Codecov Report

Merging #2593 (84743b4) into main (813add0) will decrease coverage by 0.07%.
The diff coverage is 83.33%.

❗ Current head 84743b4 differs from pull request most recent head 4d957e4. Consider uploading reports for the commit 4d957e4 to get more accurate results

@@             Coverage Diff              @@
##               main    #2593      +/-   ##
============================================
- Coverage     86.65%   86.57%   -0.08%     
- Complexity     2795     2804       +9     
============================================
  Files           321      321              
  Lines          8368     8357      -11     
  Branches       1024     1020       -4     
============================================
- Hits           7251     7235      -16     
- Misses          849      854       +5     
  Partials        268      268              

Impacted Files	Coverage Δ
...rg/mockito/internal/util/collections/ListUtil.java	54.54% <ø> (-45.46%)	⬇️
...a/org/mockito/internal/util/reflection/Fields.java	82.92% <40.00%> (-0.41%)	⬇️
...guration/injection/PropertyAndSetterInjection.java	100.00% <100.00%> (ø)
...mockito/internal/debugging/InvocationsPrinter.java	100.00% <100.00%> (ø)
...mockito/internal/invocation/InvocationsFinder.java	100.00% <100.00%> (ø)
...invocation/finder/VerifiableInvocationsFinder.java	100.00% <100.00%> (ø)
.../mockito/internal/junit/UnusedStubbingsFinder.java	100.00% <100.00%> (ø)
...nal/verification/DefaultRegisteredInvocations.java	95.65% <100.00%> (+0.19%)	⬆️
...erification/checkers/MissingInvocationChecker.java	86.95% <100.00%> (-1.05%)	⬇️

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[TimvdLippe]

With "Android users", I meant those that are using Mockito on older versions of Android that does not support lambda's and all. However, these projects can desugar, which might solve the problem.

Therefore, if we are still compatible with Android SDK 24 (I believe that's the version we use), I think we can merge this as-is. Let's see what CI says.

[TimvdLippe]

Seems like CI is happy, so we can make this change after all. Thanks for submitting this again! Only a couple of small comments.

[TimvdLippe]

Thanks for getting back to us! Yes, this is a great cleanup and the Stream usages read a lot cleaner than we had before. Merging 🎉