Use importlib to implement simport

[QuLogic]

1. You have run tests on this submission locally using pytest on your changes. Continuous integration will be run on all PRs with GitHub Actions, but it is good practice to test changes locally prior to a making a PR.
2. This pull request is directed to the pysal/master branch.
3. This pull introduces new functionality covered by
   docstrings and
   unittests?
4. [n/a] You have assigned a
   reviewer and added relevant labels
5. The justification for this PR is:

It seems the previous exec/eval version doesn't work on Python 3.13.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.1%. Comparing base (e82d1be) to head (9156c63).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #729     +/-   ##
=======================================
+ Coverage   83.9%   85.1%   +1.2%     
=======================================
  Files        145     145             
  Lines      15583   15585      +2     
=======================================
+ Hits       13077   13270    +193     
+ Misses      2506    2315    -191     

Files	Coverage Δ
libpysal/common.py	71.9% <100.0%> (ø)

... and 4 files with indirect coverage changes

[martinfleis]

Thanks!