Draft RFC: Vercel integration with MaC

[umutuzgur]

We want to support our vercel integration using MaC as well. This is mainly about creating vercel checks between for example domain switches. There are some obstacles with this given we don't get these events automatically without a vercel integration.

Here are some ideas on how to achieve this:

• Create a checkly.json during the vercel build process and fetch the json to execute test&deploy
• Create checkly deployment_status to handle different CDN deployment logic