Show what version was used to create a Pro Project

[LarkinPhil]

Problem:

It would be helpful to have an easier method to identify what version of ArcGIS Pro was used to create a project. The current methods are cumbersome, non-intuitive, and not universally available.

Requests:

1) The version of Pro used to create an aprx should be a property of the file exposed in Windows' file explorer. Maybe Product Version or File Version could be utilized. 

2) The version of Pro exposed as a property displayed in the Info section:

Alternative Methods: 

Save Window

1) Open Project

2) From ribbon click Project Tab

3) From side bar click on Save Project.

4) Version of file is shown in warning if the current version of Pro is different. Example: 

Python:

import arcpy
aprx = arcpy.mp.ArcGISProject('current')
print(aprx.documentVersion)
2.9.0