Create Warning, Info modals (#4518)
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* Styling for error, warning and info toasts (#4603)
* create abstract toast component for info/warning/error
* add icons
* add light mode theming
* add theme mode check and dark mode styles
* update theme_mode on update
* clean up render of toast content
* replace dynamic css vars with toast type css selectors
* tweak colours
* change error pill border colour to align with toasts
* formatting
* fix failed test
* rename icon files and clean up css
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Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
Co-authored-by: Hannah <hannahblair@users.noreply.github.com>
