feature: ability to add attachments to tests or steps

[gibiw]

• qase.attach - add an attachment to test or step

it('test', () => {
  qase.attach({ paths: '/path/to/file' });
  qase.step('Step 1', () => {
    cy.visit('https://example.com');
    qase.attach({ name: 'attachment.txt', content: 'Hello, world!', contentType: 'text/plain' });
  });
});