feat: add opt-in blockESLintPlugin

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🚀 Feature: Add an opt-in block for setting up an ESLint plugin #1936
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Adds a Block that devs can use to sync tooling for ESLint plugins built on CTA. It replaces the default example files with its own, so creating a new repo will look like:

npx create-typescript-app --add-eslint-plugin --exclude-example-files

🎁

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.81%. Comparing base (c2b0fc7) to head (3be3c93).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #2131    +/-   ##
========================================
  Coverage   99.81%   99.81%            
========================================
  Files         128      129     +1     
  Lines        5292     5425   +133     
  Branches      383      387     +4     
========================================
+ Hits         5282     5415   +133     
  Misses         10       10            

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[github-actions]

🎉 This is included in version v2.25.0 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀