add ability for tcp and icmp checks.

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Is your feature request related to a problem? Please describe. We do http monitoring but we have some api's that are not http but are at tcp level. Having monitoring for tcp connections basic check on URL and any Port is great. Can integrate tls as well.

Describe the solution you'd like as part of addition of api checks, we can add tcp as an option in the drop down.

Describe alternatives you've considered using datadog right now .

Additional context Add any other context or screenshots about the feature request here.

original GH issue link https://github.com/checkly/public-roadmap/issues/96