feat: Customizable toolbar button size

[QubaB]

Implemented 3 different sizes of toolbar buttons to allow user to choose smaller buttons if toolbar takes too big area of screen.

Closes #1146
also partialy closes #1177 (here probably the possibility to hide toolbar when typing text will be better solution - for example long press on text toolbar button)

[codecov]

Codecov Report

Attention: Patch coverage is 37.61468% with 68 lines in your changes are missing coverage. Please review.

Project coverage is 37.56%. Comparing base (5b64bd8) to head (a6b285d).
Report is 86 commits behind head on main.

❗ Current head a6b285d differs from pull request most recent head a58825e. Consider uploading reports for the commit a58825e to get more accurate results

Files	Patch %	Lines
lib/pages/home/settings.dart	0.00%	29 Missing ⚠️
lib/components/toolbar/toolbar_button.dart	50.00%	15 Missing ⚠️
lib/components/toolbar/pen_modal.dart	0.00%	6 Missing ⚠️
lib/components/toolbar/size_picker.dart	0.00%	6 Missing ⚠️
lib/components/toolbar/toolbar.dart	58.33%	5 Missing ⚠️
lib/components/toolbar/color_bar.dart	73.33%	4 Missing ⚠️
lib/data/prefs.dart	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1182      +/-   ##
==========================================
+ Coverage   37.49%   37.56%   +0.06%     
==========================================
  Files         108      108              
  Lines        8564     8668     +104     
==========================================
+ Hits         3211     3256      +45     
- Misses       5353     5412      +59     

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[QubaB]

I probably did not choosed the best way. If you @adil192 tell me how to do it better, I rewrite code.

I would like to have this option. Now my toolbar takes up two lines.