Update codebase to modern typing syntax

[abey79]

Description

By using from __future__ import annotations, modern typing syntax may be used in a code base intended to run on older python version. This PR systematically adds this statement and comprehensively updates the typing syntax thanks to pyupgrade.

Checklist

• feature/fix implemented
• code formatting ok (black and isort)
• mypy returns no error
• tests added/updated and pytest succeeds
• documentation added/updated
  • command docstring and option/argument help
  • README.md updated (Feature Overview)
  • CHANGELOG.md updated
  • added new command to reference.rst
  • RTD doc updated and building with no error (make clean && make html in docs/)

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #427 (80a7949) into master (2964c17) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #427      +/-   ##
==========================================
+ Coverage   93.78%   93.83%   +0.05%     
==========================================
  Files          59       59              
  Lines        5165     5210      +45     
  Branches      766      766              
==========================================
+ Hits         4844     4889      +45     
  Misses        205      205              
  Partials      116      116              

Impacted Files	Coverage Δ
tests/conftest.py	83.33% <100.00%> (+0.18%)	⬆️
tests/test_benchmarks.py	93.75% <100.00%> (+0.20%)	⬆️
tests/test_command_files.py	100.00% <100.00%> (ø)
tests/test_commands.py	99.02% <100.00%> (+<0.01%)	⬆️
tests/test_config.py	100.00% <100.00%> (ø)
tests/test_files.py	98.77% <100.00%> (ø)
tests/test_geometry.py	100.00% <100.00%> (ø)
tests/test_hpgl.py	100.00% <100.00%> (ø)
tests/test_layers.py	100.00% <100.00%> (ø)
tests/test_line_index.py	100.00% <100.00%> (ø)
... and 46 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2964c17...80a7949. Read the comment docs.