Add Tests

[thomasttvo]

Note

Adds extensive Jest tests for ReactNativeZoomableView, configures Jest setup/coverage, and updates CI to Node 20 with Codecov uploads.

• Tests:
  • Add comprehensive Jest suites for ReactNativeZoomableView covering gestures, callbacks, rendering, methods, integration, and advanced cases under src/__tests__/ with shared helpers.
  • Enforce coverage via collectCoverageFrom and global coverageThreshold in package.json.
• Tooling/Config:
  • Add jest.setup.js to mock RN modules and animation frame APIs.
  • Update Jest config: setupFilesAfterEnv, testMatch, coverage collection, and ignore patterns; add ESLint overrides for test files.
• CI:
  • Replace workflow with CI running on push/PR to master; use Node 20, cache yarn, run TypeScript, ESLint, Jest with coverage, and upload reports via codecov-action@v3.

^{Written by Cursor Bugbot for commit 3591335. Configure here.}