Deprecate hole2 class in favour of MDAKit

[IAlibay]

Fixes #4179

Changes made in this Pull Request:

• HOLE2 is now deprecated and will be removed in version 3.0

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

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📚 Documentation preview 📚: https://mdanalysis--4200.org.readthedocs.build/en/4200/

[github-actions]

Linter Bot Results:

Hi @IAlibay! Thanks for making this PR. We linted your code and found the following:

Some issues were found with the formatting of your code.

Code Location	Outcome
main package	⚠️ Possible failure
testsuite	⚠️ Possible failure

Please have a look at the darker-main-code and darker-test-code steps here for more details: https://github.com/MDAnalysis/mdanalysis/actions/runs/5566612976/jobs/10167857069

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Please note: The black linter is purely informational, you can safely ignore these outcomes if there are no flake8 failures!

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (2e39563) 93.61% compared to head (fee090d) 93.61%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4200   +/-   ##
========================================
  Coverage    93.61%   93.61%           
========================================
  Files          193      193           
  Lines        25170    25174    +4     
  Branches      4059     4060    +1     
========================================
+ Hits         23562    23566    +4     
  Misses        1092     1092           
  Partials       516      516           

Impacted Files	Coverage Δ
package/MDAnalysis/analysis/hole2/hole.py	83.07% <100.00%> (+0.17%)	⬆️

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