Props to control HideOnScroll behavior of AppBar

[pkspyder007]

Is your feature request related to a problem? Please describe.
I have a fixed sidebar that is toggled by the App bar for expanding and collapsing. But after scrolling down there is no button to toggle the side menu until the user scrolls back up.

Screen.Recording.2021-04-15.at.9.55.18.PM.mov

Describe the solution you'd like
Ability to control the hideOnScroll behaviour through a prop on AppBar component would be really helpful for enhancing user experience.

Describe alternatives you've considered
Adding a second toggle button behind the appbar in side menu, but that would be redundant.

[pkspyder007]

@djhi We are using React-admin a lot at Navidrome. There are few suggestions I would like to give.

• Having the ability for fixed/sticky side menu
• Changing Menu icon in AppBar on toggling

React-Admin provides the ability to provide a custom implementation for these use-cases but deviates us from the framework. Having the ability to change such properties based on props or some other method will help a lot.
I appreciate the work that you people have put in creating such an amazing technology 🙌

[fzaninotto]

Fixed by #6178