make qcodes.__version__ lazy

[jenshnielsen]

This speeds up importing qcodes from an editable install with ~ 0.6-0.7 s assuming that you do not actually make use of the __version__ attribute. By only doing this in a if not TYPE_CHECKING: block we avoid losing static type information about top level attributes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.02%. Comparing base (5192c2f) to head (737cb3c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5931   +/-   ##
=======================================
  Coverage   71.02%   71.02%           
=======================================
  Files         301      301           
  Lines       31896    31896           
=======================================
  Hits        22655    22655           
  Misses       9241     9241           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.