Ability to control entry/exit animations of RotateAnimatedText

**Is your feature request related to a problem? Please describe.**
_A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]_

Currently. there is no way to control the direction of `RotateAnimatedText` for entry/exit animations.

**Describe the solution you'd like**
_A clear and concise description of what you want to happen._

* Ability to override exit animation for example to fade out and up or out and down.
* Ability to override entry animation for example to fade in and down or in and up.

**Describe alternatives you've considered**
Creating a custom text animation appears to be the only valid alternative, however, I feel like this can be built into the current widget.

**Additional context**
_Add any other context or screenshots about the feature request here._

[animate_do](https://pub.dev/packages/animate_do) has some examples of fading options:
### FadeIn Animations
* FadeIn
* FadeInDown
* FadeInDownBig
* FadeInUp
* FadeInUpBig
* FadeInLeft
* FadeInLeftBig
* FadeInRight
* FadeInRightBig
### FadeOut Animations
* FadeOut
* FadeOutDown
* FadeOutDownBig
* FadeOutUp
* FadeOutUpBig
* FadeOutLeft
* FadeOutLeftBig
* FadeOutRight
* FadeOutRightBig