Add Tests workflow and replace Jest with node:test

[risantos]

Description

• Add a Tests workflow using GitHub Actions.
• Remove Jest in favor of Node.js built-in test module, node:test.
• Update the README with new test instructions and status badges.
• Minimum Node.js version is now set to 20.

[Copilot]

Pull Request Overview

This PR migrates testing from Jest to Node.js’s built-in node:test, adds a GitHub Actions workflow for tests and coverage, removes Jest and Travis CI config, updates package scripts and README badges, and bumps the minimum Node.js version to 20.

• Replace Jest with node:test in all test files and introduce a shared test-http-error util.
• Remove jest.json and .travis.yml, update package.json scripts, and add .github/tests.yaml workflow.
• Update README with new test instructions, status badges, and bump engines to Node.js ≥20.

Reviewed Changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/utils/test-http-error.js	Updated to use node:test’s it and assert, replaced Jest API
test/errors/*_test.js	Replaced Jest imports with node:test and calls to testHttpError
package.json	Updated test scripts, removed Jest dependency, bumped Node engine
jest.json	Removed (no longer needed)
README.md	Added badges and updated test instructions
.travis.yml	Removed Travis CI config
.github/tests.yaml	Added GitHub Actions workflow for tests and coverage

Comments suppressed due to low confidence (1)

test/utils/test-http-error.js:14

• Parameter Error shadows the global Error constructor. Consider renaming it to ErrorClass or HttpErrorConstructor for clarity.

module.exports = (Error, code, message, testArguments = true) => {

[Kamefrede]

LGTM