feat: plug-and-play test environment

[noomorph]

This pull request migrates jest-metadata to use jest-environment-emit.

This change enables you to plug as many environment listeners as you need, e.g.:

/** @type {import('jest').Config} */
module.exports = {
  // ...
  testEnvironment: 'jest-metadata/environment-node',
  testEnvironmentOptions: {
    eventListeners: [
      './simple-subscription-1.js',
      ['./parametrized-subscription-2.js', { some: 'options' }],
    ]
  },
};

[github-actions]

🎉 This PR is included in version 1.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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