[SCons] Display SCons version

[ischoegl]

Changes proposed in this pull request

Displaying the SCons version will make it easier to troubleshoot.

If applicable, fill in the issue number this pull request is fixing

Also see #1253, #1265 and #1267

If applicable, provide an example illustrating new features this pull request is introducing

$ scons build
scons: Reading SConscript files ...
INFO: SCons 4.3.0 is using the following Python interpreter: 
/path/to/python (Python 3.10)
INFO: Building Cantera from git commit 'a8edfe4ff'
[...]

Checklist

• The pull request includes a clear description of this code change
• Commit messages have short titles and reference relevant issues
• Build passes (scons build & scons test) and unit tests address code coverage
• Style & formatting of contributed code follows contributing guidelines
• The pull request is ready for review