Allow setting the initial state of the AnimationTextController

[YukiAttano]

Is your feature request related to a problem? Please describe.
I would like chain some of the Animations.

Describe the solution you'd like
To allow this, it should be enough to set the initial AnimatedTextState in AnimatedTextController()
EDIT: The AnimatedText should also not override this value.
change

// in _initAnimation()

 _animatedTextController.state = AnimatedTextState.playing; // remove
 _controller.forward();

to

// in _initAnimation()

// _animatedTextController.state = AnimatedTextState.playing; 
if (_animatedTextController.state == AnimatedTextState.playing) _controller.forward();

Additional context
I have a title and a subtitle where the title should start animating instantly, while the subtitle starts after that.
Both should than stay on screen.

Something like:
Title: "Welcome to my App"
Subtitle: "Before we start, we have a few questions for you"