fix: replace use of deprecated methods

[G-Rath]

Checks

• I have read the contributing guidelines.

Changes

• introduced compat utilities that enable support for ESLint v9
• replaced usages of context functions that were removed in v9 in favor of compat utils

Context

Resolves #924
Resolves #899

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.35%. Comparing base (93a6ab9) to head (df12d17).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #925      +/-   ##
==========================================
+ Coverage   96.23%   96.35%   +0.11%     
==========================================
  Files          44       45       +1     
  Lines        2419     2470      +51     
  Branches     1000     1028      +28     
==========================================
+ Hits         2328     2380      +52     
+ Misses         91       90       -1     

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[G-Rath]

#926 proves that this works with ESLint v7, v8, and v9 so I think this should be safe to merge as-is and then we'll be one step closer to supporting ESLint v9 officially

(the CI failure is just a flakey timeout - it should pass if rerun)

[G-Rath]

@Belco90 @MichaelDeBoey would it be possible to get this and my follow-up PRs progressed, given that they can be released in a minor version?