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CLI: Add native support for ESM .mjs files on Node 12+

* Rename test/es2017 and update ESLint config to allow for import/export
  syntax to be used. We don't rely on ESLint to know what is supported
  in Node.js, our test matrix in CI covers that already.

  We should probably re-think the way these tests are organized,
  which I've filed https://github.com/qunitjs/qunit/issues/1511 for.

* Update eslint config for src/cli to es2020. The dynamic `import()`
  statement was only spe'ced in es2020. This is first implemented
  (without experimental flag) in Node 12. We need to support Node 10.
  However it looks like Node 10 already tolerated this (maybe it sees
  it as a normal function, or maybe it was already recognised by the
  V8 parser it shipped with), so the try-catch suffices there.
  Again, the CI test matrix verifies for us that stuff works fine
  on older versions.

Ref https://github.com/qunitjs/qunit/issues/1465.
Closes https://github.com/qunitjs/qunit/pull/1510.

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