feat: Ergonomic improvements in ScrollView

[marc2332]

Both ScrollView and VirtualScrollView no longer use a theme for the width, height, padding and spacing. And now, both of them can shrink to the size of its children size in the axis direction when that is "auto". So for example you can make a vertical ScrollView shrink to its inner children size by specifying a width: "auto"

Closes #857

[codecov]

Codecov Report

Attention: Patch coverage is 93.49593% with 8 lines in your changes missing coverage. Please review.

Project coverage is 75.98%. Comparing base (394774b) to head (8da6880).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...components/src/scroll_views/virtual_scroll_view.rs	91.66%	5 Missing ⚠️
crates/components/src/scroll_views/mod.rs	86.66%	2 Missing ⚠️
crates/components/src/scroll_views/scroll_view.rs	97.91%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #858      +/-   ##
==========================================
+ Coverage   75.95%   75.98%   +0.02%     
==========================================
  Files         205      205              
  Lines       22974    23017      +43     
==========================================
+ Hits        17450    17489      +39     
- Misses       5524     5528       +4     

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