Fix edge case of __future__ import.

[skv0zsneg]

Fixing #1882

Every FUTURE section now have the "from first" rule by default to avoid exception below:

SyntaxError: from __future__ imports must occur at the beginning of the file

[skv0zsneg]

The deepsource checks warns me of cyclomatic complexity here but I got only one small change. Do I need to split the logic for decrease complexity?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.24%. Comparing base (e8c127b) to head (313797b).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2458   +/-   ##
=======================================
  Coverage   99.24%   99.24%           
=======================================
  Files          39       39           
  Lines        3057     3057           
  Branches      675      675           
=======================================
  Hits         3034     3034           
  Misses         13       13           
  Partials       10       10           

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[DanielNoord]

Just add an ignore for the warning :)