Add examples of testing for each language

Include examples in https://cdk8s.io/docs/latest/examples/ for each language of how to use the testing framework.

Suggested by @Hunter-Thompson:

can we also have a small example of how a test would look like for Go?

To convert the following in Go.

  const app = Testing.app();
  const chart = new Chart(app, 'test');

  new Deployment(chart, 'test', {

  });


  expect(Testing.synth(chart)).toMatchSnapshot();

Related: https://github.com/cdk8s-team/cdk8s-core/issues/35

[Hunter-Thompson]

keep

[github-actions[bot]]

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