Abstract esprima dependency with foresta.parse() and foresta.query() API

- Add foresta.parse() to parse JavaScript code without requiring users to import esprima
- Add foresta.query() convenience method for one-line parse and query
- Update all examples to use new API (no more esprima imports needed)
- Add 16 new tests for the new API methods (73 total tests passing)
- Update README with comprehensive API documentation
- Update GitHub Actions CI to explicitly run build step
- Maintain full backward compatibility with traditional constructor API

Co-authored-by: joelmartinez <90380+joelmartinez@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -28,6 +28,9 @@ jobs:
     - name: Install dependencies
       run: npm ci
 
+    - name: Build
+      run: npm run build
+      
     - name: Run tests
       run: npm test