feat: Add new setting to enforce future imports for all annotations

[Daverball]

Closes #190

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.8%. Comparing base (7621d51) to head (3d884d6).
Report is 90 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #200     +/-   ##
=======================================
- Coverage   98.7%   96.8%   -2.0%     
=======================================
  Files          3       3             
  Lines        482     972    +490     
=======================================
+ Hits         476     941    +465     
- Misses         6      31     +25     

Files with missing lines	Coverage Δ
flake8_type_checking/checker.py	96.5% <100.0%> (-2.0%)	⬇️
flake8_type_checking/plugin.py	100.0% <ø> (ø)