Implement checker as annotation processor

[Garciat]

Fixes #19

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.86%. Comparing base (31ed0b4) to head (d46963b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../com/garciat/typeclasses/processor/TreeParser.java	83.92%	4 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #22      +/-   ##
============================================
+ Coverage     65.78%   65.86%   +0.08%     
- Complexity      289      322      +33     
============================================
  Files            54       55       +1     
  Lines           792      788       -4     
  Branches         70       63       -7     
============================================
- Hits            521      519       -2     
+ Misses          224      223       -1     
+ Partials         47       46       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.