Components Library: Toast - added expiry indication/progress bar

[sallkall]

🎯 Update/Fix

• Added expiry progress bar to all toast styles to provide better timeout feedback
• Progress bar syncs with toast timeout

🔗 Zeplin Link

• Toast

🔍 Design Preview

[sallkall]

@kc-leung here's a very rough countdown animation for demo purposes just so you get the idea, what we want in the end is a smooth countdown bar. Let me know if you have any other questions.