Create custom Alert component

[buberdds]

Waits for design validation https://pr-55.oasis-ui.pages.dev/?path=/docs/components-alert--docs&globals=theme:light

• adds warning and filled variants needed in Explorer
• not sure about border in error variant. in designs it is a mix of two colors, but it looks weird in light theme so it's applied only in dark mode
• Explorer examples are in Replace MUI Alert with Oasis UI Library component explorer#2128

[github-actions]

Deployed to Cloudflare Pages

Latest commit:	25b7edf122b960051a8c5e6f43b6756f5c1b51a1
Status:	✅ Deploy successful!
Preview URL:	https://ec0fec83.oasis-ui.pages.dev
Alias:	https://pr-55.oasis-ui.pages.dev

[donouwens]

@buberdds , I think these are great!

Two small questions;

1. Why are we showing >_ as an icon on the info state? Perhaps we can use this icon?
2. Perhaps we need a success state as well (both empty and filled)?

[buberdds]

@donouwens thx for feedback

1. No idea why it is used in a design guide. Anyway, replaced with info.
2. Added success variants

[buberdds]

This is accepted by @donouwens, moving to code review