[FEATURE REQUEST] Extend ps Beacon

[KiyoIchikawa]

Is your feature request related to a problem? Please describe.
Extend the ps Beacon to support watching processes for a specific user and return more information about the process.

Describe the solution you'd like
Allow specifying a username in the configuration and return information such as the PID and create time to allow calculating how long the process has been running.

Describe alternatives you've considered
No alternative.

Additional context
My specific scenario was watching IIS Application Pool worker processes for when they stopped/crashed. That scenario is no longer relevant to me, but I believe these would be good enhancements regardless.

Please Note
If this feature request would be considered a substantial change or addition, this should go through a SEP process here https://github.com/saltstack/salt-enhancement-proposals, instead of a feature request.

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