provide a simple version helper script to interact with ES

[mtfriesen]

Description

Describe the purpose of and changes within this Pull Request.

The internal ES needs to know our version information, so provide that via a simple script.

Testing

Do any existing tests cover this change? Are new tests needed?

N/A.

Documentation

Is there any documentation impact for this change?

N/A.

Installation

Is there any installer impact for this change?

N/A.

[guhetier]

Is there a reason not to create a "version.json" file like ES was using previously?
Is it because the tag / version.json version info would mismatch?

[mtfriesen]

Is there a reason not to create a "version.json" file like ES was using previously? Is it because the tag / version.json version info would mismatch?

XDP never used version.json - it had already created a native .props file before the ES repo was incarnated. The reason XDP didn't switch (aside from inertia) is the powershell script to parse version.json slows builds down dramatically, at least on dev boxes where starting powershell.exe is relatively expensive.