feat: migrate test suite to Node.js native tests and ESM

[jlucaso1]

• Replace Mocha with Node.js native test runner
• Convert all test files from CommonJS to ES Modules
• Add some CLI tests
• Use esbuild instead rollup (has two different output files specific for cjs and esm)
• Deleted AMD test because we don't compile to AMD/UMD anymore (the esm will work on browsers)

This commit modernizes our testing infrastructure by leveraging Node.js built-in test runner and embracing ES Modules across our test suite. It also introduces new tests for the CLI functionality.