👋🏼 Let's get Coracle with a good test coverage! 💯

In this PR:

• Use vitest for unit and integration testing;
• unit tests are inside the folder tests/unit;
• The tests/unit folder mirrors the src folder;
• Script npm run test:unit runs only the unit tests. Script npm run test runs all types of tests;
• Unit test examples on sortEventsAsc and sortEventsDesc functions;
• Test utils under tests/utils;
• Added README.md tests documentation.

Future work:

• Add more unit tests;
• Add integration tests;
• Run tests via pipeline (when pr to master in opened);
• Consider Playwright over cypress.

Let me know what you think 👍🏼