Add individual sidebar toggle button

[acelaya]

Closes #713

Espose a new ShlinkSidebarToggleButton component that can be used to customize the location of the sidebar toggle, rather than making it assume there's a header bar and position it there.

[codecov]

Codecov Report

❌ Patch coverage is 87.93103% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.80%. Comparing base (e1bc59e) to head (5d06103).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sidebar/ShlinkSidebarToggleButton.tsx	88.88%	0 Missing and 3 partials ⚠️
src/Main.tsx	60.00%	0 Missing and 2 partials ⚠️
src/sidebar/ShlinkSidebarVisibilityProvider.tsx	84.61%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #758      +/-   ##
==========================================
+ Coverage   79.77%   79.80%   +0.02%     
==========================================
  Files         174      176       +2     
  Lines        7985     8011      +26     
  Branches     1495     1500       +5     
==========================================
+ Hits         6370     6393      +23     
+ Misses        145      143       -2     
- Partials     1470     1475       +5     

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