Implement PSP version functions

[jphickey]

Is your feature request related to a problem? Please describe.
A simple API to get version info was discussed in nasa/cFS#200.

Describe the solution you'd like
PSP should implement the same API discussed there, to evolve the current macros/globals.

Additional context
Already implemented in nasa/osal#824 - this will make PSP consistent with that.

Requester Info
Joseph Hickey, Vantage Systems, Inc.