RomiC / rsql-builder / 20674715099

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Migrate from Jest to Node.js built-in test runner (#514)

* Migrate from Jest to Node.js built-in test runner

Replace Jest testing framework with Node.js native test runner and assertion
library for zero external testing dependencies and better integration with
modern Node.js >= 20 runtime.

Changes:
- Convert all test files from TypeScript (.spec.ts) to JavaScript (.spec.js)
- Replace Jest test syntax (describe/it) with node:test module
- Replace Jest expect() assertions with assert.strictEqual() from node:assert/strict
- Update package.json test script to use 'node --test' command
- Add built-in test coverage support with --experimental-test-coverage flag
- Configure coverage to only include dist/*.js (compiled source files)
- Generate lcov.info report in coverage/ directory for CI/CD compatibility
- Remove Jest-related dependencies: @types/jest, jest, ts-jest
- Remove Jest configuration from package.json
- Remove tests/tsconfig.json (no longer needed for JS tests)

Benefits:
- Zero external testing dependencies
- Native Node.js >= 20 support as specified in engines field
- 100% test coverage (20 tests, 15 suites, all passing)
- Compatible with existing coverage tools via lcov format
- Faster test execution with native runtime
- Simplified maintenance without Jest version updates

* Use c8 for test coverage instead of experimental Node.js coverage

- Replace experimental --experimental-test-coverage with c8
- c8 provides reliable coverage on Node.js 20+
- Generate both text report (console) and lcov format
- Remove test:coverage script in favor of single test command with coverage

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