feat: Add .cts to support typescript 4.7

[cspotcode]

Resolves #89

This is likely blocked by publication of the next version of ts-node which adds support for the new file extensions.

[cspotcode]

I've updated this PR to use typescript 4.7 rc, which will become stable in about 4 days, and to use the newest ts-node, which supports cts.

I also removed some of the alternative transpilers from the cts file extension because they were failing. I'm not sure if this was a misconfiguration on my part, or if it was because they don't support .cts.

[phated]

@cspotcode Yeah, I think we should only support this through ts-node as it seems a bit specialized. I'd prefer not to use the RC, so let's wait to land this until 4.7 is released

[phated]

@cspotcode has 4.7 been released? I don't keep up on these things. Can you update if so?

[cspotcode]

Yeah, 4.7 is out, I've updated this PR accordingly.

[phated]

Couple of comments. Let's get this cleaned up and I'll make a release!

[phated]

Thanks @cspotcode! I cleaned up the non ts-node stuff

[cspotcode]

Thanks! I've been super busy, I appreciate it