feat: add font family support to app bar theme

[zeshuaro]

Relate to #528

[codecov]

Codecov Report

Base: 95.39% // Head: 95.39% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (a1e54ba) compared to base (44cb039).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #545   +/-   ##
=======================================
  Coverage   95.39%   95.39%           
=======================================
  Files         111      111           
  Lines        4145     4149    +4     
=======================================
+ Hits         3954     3958    +4     
  Misses        191      191           

Flag	Coverage Δ
appainter	95.70% <100.00%> (+<0.01%)	⬆️
appainter_builder	78.37% <ø> (ø)

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Impacted Files	Coverage Δ
...ct_text_style/cubit/abstract_text_style_cubit.dart	100.00% <100.00%> (ø)
...ct_text_style/view/abstract_text_style_editor.dart	100.00% <100.00%> (ø)

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