Support lightweight web change detection with snapshot match

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Is your feature request related to a problem? Please describe. playwright is nice but still a lot of work if all you want to make sure your website is live. instead, it would be much easier to take a snapshot/screenshot (typically steady-state, not changing website) and code the check to compare it, like https://playwright.dev/docs/test-snapshots

Describe the solution you'd like above.

Describe alternatives you've considered perhaps a no-code option just for a screen diff. doesn't have to use playwright

Additional context toMatchSnapshot? The issue is that it's part of @playwright/test which Checkly doesn't support at the moment. You can see however that it isn't completely out of our radar https://github.com/checkly/public-roadmap/issues/167.

original GH issue link https://github.com/checkly/public-roadmap/issues/179