Progress display component

[taorepoara]

Create a component to display a progress to the final user.

This component can have different shapes in order to feet in desired places: circle/round or linear. See the Flutter CircularProgressIndicator and LinearProgressIndicator.

If no value is defined on the component it enter in an indeterminated status with an animation to understand that something is going on.

The component has a text property to display a text linked to the progression, and startLabel and endLabel properties to display text to display start value information (like 0%) and end value information (like 100%) respectively.