test: start converting unit tests over to ESM-friendly tests

[rossiam]

Module Mocking in ESM

• run unit tests with --experimental-vm-modules option (package.json)
• updated inquirer dependency to ES module-only version 9 (package.json)
• temporarily disabled running unit tests except a few which have been converted (jest.config.ts)
• converted a small starter-set of unit tests to ESM format
• refactored api-helpers.test.ts somewhat
  • removed top-level describe
  • passed mock SmartThingClient into tested functions rather than spying on endpoints
  • singular withLocation and withNameAndLocation proxies to withLocations and withNamesAndLocations no longer use spy. (I was unable to get this to work.)

Checklist

• [x] I have read the CONTRIBUTING document
• [x] My code follows the code style of this project (npm run lint produces no warnings/errors)

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Latest commit: 751e5e13623804c47d127a3ee7defcbb57561faf

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