feat(plugin-eslint): add support for custom groups

[hanna-skryl]

Closes #897

This PR introduces support for custom groups in the ESLint plugin, enabling users to define and categorize ESLint rules with custom weights and configurations.

[matejchalk]

Really looking forward to this feature 🚀

Implementation overall looks good and is very well tested 👍

Left a few suggestions.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared target commit 0101cfe with source commit b230a3d.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🟡 52	🔴 47
Documentation	🔴 23	🔴 23
Code coverage	🟢 91	🟢 91
Security	🟡 81	🟡 81	–
Updates	🟡 77	🟡 77	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–

👎 3 groups regressed, 👍 1 audit improved, 👎 11 audits regressed, 10 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🟡 52	🔴 47
JSDoc coverage	Documentation coverage	🔴 23	🔴 23
Code coverage	Code coverage metrics	🟢 91	🟢 91

15 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Speed Index	🟨 5.6 s	🟥 7.1 s
Lighthouse	Largest Contentful Paint	🟨 3.5 s	🟨 3.8 s
Lighthouse	Time to Interactive	🟥 13.4 s	🟥 15.0 s
Lighthouse	First Contentful Paint	🟨 2.8 s	🟨 2.9 s
JSDoc coverage	Classes coverage	🟥 6 undocumented classes	🟥 7 undocumented classes
Lighthouse	Total Blocking Time	🟥 3,490 ms	🟥 6,810 ms
Code coverage	Function coverage	🟩 93.3 %	🟩 93.1 %
JSDoc coverage	Types coverage	🟥 195 undocumented types	🟥 198 undocumented types
Code coverage	Branch coverage	🟨 86 %	🟨 86.1 %
JSDoc coverage	Functions coverage	🟥 432 undocumented functions	🟥 437 undocumented functions
Code coverage	Line coverage	🟩 90.1 %	🟩 90.1 %
JSDoc coverage	Variables coverage	🟥 193 undocumented variables	🟥 196 undocumented variables
Lighthouse	Minimizes main-thread work	🟥 13.5 s	🟥 19.1 s
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,821 KiB	🟩 Total size was 1,817 KiB
Lighthouse	JavaScript execution time	🟥 5.8 s	🟥 8.7 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Max Potential First Input Delay	🟥 2,000 ms	🟥 2,490 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 680 ms	🟥 Potential savings of 390 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Server Backend Latencies	🟩 190 ms	🟩 240 ms
Lighthouse	Initial server response time was short	🟥 Root document took 670 ms	🟥 Root document took 680 ms
Lighthouse	Network Round Trip Times	🟩 70 ms	🟩 70 ms

574 other audits are unchanged.