Add pid file configuration option

Is your feature request related to a problem? Please describe.

I'd like to run the Temporal server process as a daemon locally and it would be useful if the server could write its PID to a file.

Describe the solution you'd like

I imagine it working as follows:

1. Specify path to the pid file in the configuration
2. The server writes its PID on start
3. The server deletes the PID file on shutdown

Describe alternatives you've considered

I could also implement this myself with another tool, but it would be convenient if it was built-in.

Additional context

We don't use Docker for local development but rather run dependent servers as processes directly, so now I have to figure out some daemonization process myself. I'm trying to figure out if there's a way in which Temporal server could make this easier.