Tooling: Add a testing framework

[rubenmate]

Background

To ensure the reliability and quality of our software, we need to implement a comprehensive testing framework. This will help us catch bugs early and maintain high standards.

Goals

Develop a testing framework that covers unit and integration tests.
Ensure tests are clear, concise, and maintainable.

Proposed Solution

Choose a testing framework that integrates well with our development tools.
Write clear, concise test cases following best practices for consistency, objectivity, and precision.
Regularly review and update test cases to reflect changes in the software.

[rubenmate]

Added jest for unit tests in #16
Added playwright for e2e tests in #17