Add a version module to align with SDV Enterprise

[npatki]

Problem Description

To align the usages of SDV with SDV Enterprise, we should add a version module that the user can call to quickly see what they have installed.

Expected behavior

The expected behavior is similar to SDV Enterprise: the version module should expose an enterprise variable and a public variable. The only difference is that the enterprise variable is set to None. The public variable should return the same value as calling sdv.__version__ (current version).

>>> import sdv
>>> print(sdv.version.enterprise)
None
>>> print(sdv.version.public)
'1.9.0'
>>> print(sdv.__version__)
'1.9.0'

Additional context

This will make it easy for users and customer to troubleshoot which versions they currently have installed.