Add linear progress indicator

[JesseBuesking]

I didn't see any mention of implementing linear indicators in the other issues, but I'd really like to see this feature added or put somewhere on the roadmap. I also tried naming the issue similar to the others I had seen, so hopefully it's close! 😄

[JesseBuesking]

There are actually four distinct types of linear indicators that would need to be implemented:

• Determinate
• Indeterminate
• Buffer
• Query Indeterminate and Determinate

[ThomasBurleson]

Linear Progress Bars :

Circular Activity indicators are listed in a separate issue.