Feat / modal manager

[ChristiaanScheermeijer]

Description

This PR implements a ModalProvider and useModal hook that manages the visible modals when registered via the useModals hook.

By doing so, the following features are added:

• Close specific or all open modals using the context (Native/remote back button)
• Open multiple modals without interfering with each other
• Keep the initial focus of the first modal opened in case of open (1) -> close (1) and open(2) -> close(2)
• Handle HTMLElement#inert and body scrolling from a single place
• Escape key only closes the last opened modal

This change removes lots of duplicate code from the Modal and Sidebar components.

See the whole discussion and review here: https://github.com/Videodock/ott-web-app/pull/167

[github-actions[bot]]

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[ChristiaanScheermeijer]

Superseded by #505

[AntonLantukh]

@ChristiaanScheermeijer I will close this one.