Split out extras types

[gdalle]

DI source

• Split out basic subtypes of Extras into a single file.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.63%. Comparing base (1441260) to head (823f1fa).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #422   +/-   ##
=======================================
  Coverage   96.63%   96.63%           
=======================================
  Files         103      104    +1     
  Lines        4967     4967           
=======================================
  Hits         4800     4800           
  Misses        167      167           

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