x/sys/windows: add serial comm functions

[twpayne]

Serial ports are still widely used to communicate with a large range of
devices.

This change adds the remaining functions described in "Serial
Communications in Win32", enabling Go applications and libraries to be
written that support the full set of serial port functionality on
Windows.

x/sys/unix already has equivalent functionality through termios.

See https://learn.microsoft.com/en-us/previous-versions/ms810467(v=msdn.10).

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Patch Set 3:

This CL has failed the run. Reason:

Tryjob golang/try/x_sys-go1.22-windows-amd64 has failed with summary (view all results):

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FAILURE

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• sys on master (change 572295)

Error:
failed to run "test golang.org/x/sys module": fork/exec C:\b\s\w\ir\cache\tools\bin\rdb: The system cannot find the file specified.

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