Refactor runners into classes

[Andrew-S-Rosen]

Summary of Changes

Partially addresses #1833. This should not affect anything user-facing, although it does close #2230.

Checklist

• I have read the "Guidelines" section of the contributing guide. Don't lie! 😉
• My PR is on a custom branch and is not named main.
• I have added relevant, comprehensive unit tests.

Notes

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• When your code is ready for review, ping one of the active maintainers.

[codecov]

Codecov Report

Attention: Patch coverage is 96.13260% with 7 lines in your changes missing coverage. Please review.

Project coverage is 99.02%. Comparing base (ebd32d6) to head (4b70938).

❗ Current head 4b70938 differs from pull request most recent head 81713e5

Please upload reports for the commit 81713e5 to get more accurate results.

Files	Patch %	Lines
src/quacc/runners/ase.py	92.68%	6 Missing ⚠️
src/quacc/runners/thermo.py	96.55%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2020   +/-   ##
=======================================
  Coverage   99.02%   99.02%           
=======================================
  Files          81       81           
  Lines        3369     3374    +5     
=======================================
+ Hits         3336     3341    +5     
  Misses         33       33           

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