Add Toast Feature

[hshimshon]

Description Blazor Foundation should include a toast system in which we can easily send notifications in a single line of code most likely like the reveal controller.

Features

• Stackable Toast (Newest above the other).
• Queueable Toast (Oldest Visible First, Than other when closed).
• Timer Toast (Current is shown for a period of time either Queued or Stacked).
• Max Toast (Too many toast will kill the oldest when newest exceed threshold).
• Closable (Can destroy toast with a function).
• Clickable Toast (Can redirect to an url when clicked).
• Simple Toast (Provide simple template for basic toast (Title, Message, Close/OnClick).
• Advanced Toast (Built-in advanced template for toast (Simple +, Icon, Timer, Colors)).
• Custom Toast (Use your own custom RenderFragment just like reveal)

[hshimshon]

Pushed this to v4