Implement "CFE_PSP_GetVersion()" function

[jphickey]

Is your feature request related to a problem? Please describe.
As described in nasa/osal#821 it is better to acquire version info strings/values at runtime rather than via a macro, because of where and how it will get evaluated.

PSP is actually in better shape than OSAL/CFE because CFE_PSP_VERSION currently refers to a string which is stored in GLOBAL_PSP_CONFIGDATA. But still, it would be better and more conventional to get this value via an API call.

Describe the solution you'd like
Implement CFE_PSP_GetVersion() and related APIs to get the various version strings.

Describe alternatives you've considered
Leave in global object.

Additional context
See details in nasa/osal#821

Requester Info
Joseph Hickey, Vantage Systems, Inc.

[jphickey]

Implemented in #256, this is a duplicate

[skliper]

Duplicate issue is #257