feature: avatars and progress bars

[Bankole2000]

What does this PR do?

• Resolves #30
• Allows for Avatar in toast (with multiple avatars also possible up to 5)
• Allows for countdown progress bar in toast (default behavior)
• Updates README.md with relevant info on changes

Description of Task to be completed?

• [x] #30

How should this be manually tested?

After cloning the repo, cd into it and do the following:

# install dependencies
$ pnpm install

# start development server to view UI
$ pnpm run dev

After starting the server, the new changes can be viewed by opening localhost:5173, click new buttons to see changes in demo

Any background context you want to provide?

I just wanted a cool stackable toast bro, this is the closest I could find so, might as well do what I can to make it how I'd like it to be.

What are the relevant Notion/JIRA stories/tickets?

• 30

Screenshots (if appropriate)

https://github.com/wobsoriano/vuetify-sonner/assets/23138415/9fcaeabf-597a-4281-90b4-5f61a91e2ac6

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Name	Status	Preview	Comments	Updated (UTC)
vuetify-sonner	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 21, 2024 6:30am

[wobsoriano]

I merged this but I set the default progress bar option value to false. I want to keep it as close to the snackbar and vue-sonner behavior.