Add an ETW provider for Windows

[cuviper]

ETW appears to be the nearest equivalent technology for Windows.

• MSDN documentation: Event Tracing
• MSDN Magazine: Improve Debugging And Performance Tuning With ETW
• Ntdebugging Blog's ETW series: part 1, part 2, and part 3.

[No9]

FYI DTrace for windows was released at the start of this year.
https://www.microsoft.com/en-us/download/details.aspx?id=100441
This might be a simpler target to support
I'll try and take a look when I can but want to target FreeBSD first

[cuviper]

Wow, I didn't know about that!

I don't see any mention of sdt/usdt at a glance in the documentation, but it does support etw.
https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/dtrace
https://docs.microsoft.com/en-us/windows-hardware/drivers/devtest/dtrace-etw