CHORE: Update LICENSE file and introduce add-license-headers pre-commit hook

[ecoussoux-ansys]

This PR is updating the LICENSE file based on the model provided here and as requested in #1000.

On top of this change, the pre-commit hook add-license-headers (provided here) is added to .pre-commit-config.yaml. Going forward, this will take care of inserting the license header automatically in all files introduced to pyedb and will trigger updates to the headers every year, or upon updating the LICENSE file.

In this PR, the newly introduced hook was run on all files of the repository, updating (or introducing) the license header in a very large number of files!

Close #1000.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.08%. Comparing base (5478d77) to head (5a49b47).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1569   +/-   ##
=======================================
  Coverage   73.08%   73.08%           
=======================================
  Files         257      257           
  Lines       38921    38921           
=======================================
+ Hits        28446    28447    +1     
+ Misses      10475    10474    -1     

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[svandenb-dev]

LGTM