[Feature] Android ProgressBar element

[jamesmcroft]

Description

ProgressBar is a commonly used core Android control that supports the ability to track the progress of actions as a percentage.

The implementation should provide the following functionality:

• Get percentage
• Get whether is indeterminate

[jamesmcroft]

Digging into this one, it's harder than it seems. The value of the progress bar is not exposed through the automation tooling for Android.