Provide a method to send PosixSignal to the Process.

[moh-hassan]

There is a new feature in net6 and above that enable handling of PosixSignal
like:

 using (var intHandler = PosixSignalRegistration.Create(PosixSignal.SIGINT, HandleSignal))
 {
     Console.WriteLine("Press Ctrl+C to trigger handler.");
     LongRunning();
 }
 
 void HandleSignal(PosixSignalContext posixSignalContext)
{
    Console.WriteLine($"Received signal: {posixSignalContext.Signal}");
}

There is example in stackoverflow (https://stackoverflow.com/a/35809358) that use mono package to send SIGINT but it is not compatible with net6 PosixSignal.

It is nice if dotnet provide API to send SIGINt/SIGTERM/..signal to the process to enable graceful stopping/shutdown process.

something like:

SendSignal(int processId, PosixSignal signal)

``
The method can be part of Process class.

[jkotas]

Duplicate of #59746

[jeffhandley]

Closing as duplicate.