feat: support rive

[wasabeef]

What does this change?

• Support Rive
  Support Rive 2 i.e (*.riv) #66

[codecov]

Codecov Report

Merging #143 (5b8d18f) into main (160fd60) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
+ Coverage   98.91%   98.93%   +0.02%     
==========================================
  Files          17       18       +1     
  Lines         551      563      +12     
==========================================
+ Hits          545      557      +12     
  Misses          6        6              

Impacted Files	Coverage Δ
packages/core/lib/settings/config.dart	100.00% <ø> (ø)
packages/core/lib/generators/assets_generator.dart	100.00% <100.00%> (ø)
.../lib/generators/integrations/rive_integration.dart	100.00% <100.00%> (ø)
packages/core/lib/settings/pubspec.dart	96.15% <100.00%> (ø)
packages/core/lib/settings/pubspec.g.dart	100.00% <100.00%> (ø)

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