* feat(mobile/navigation): replaced native stack with stack navigator and other ui fixes

* feat(base/modal) added keyboard dismiss functionality

* feat(lobby) updated ui and start knocking if name is set

* feat(prejoin) updated ui and hide input if name is not required

* feat(prejoin) updated join button styles

* feat(prejoin) removed extra empty space

* feat(prejoin) updated disable join condition

* feat(base/modal) moved keaboard dismiss functionality

* feat(conference) updated auto knock condition

* feat(prejoin) updated button styles and disabling condition

* feat(lobby) updated styles

* feat(lobby/prejoin) updated styles for buttons and inputs

* feat(lobby/prejoin) updated contentContainer styles

* feat(lobby/prejoin) created shouldEnableAutoKnock helper

* feat(mobile/navigation) updated screens that have footer

* feat(chat/native) reverted style change

* feat(chat/native) reverted changes and added input vertical padding

* feat(base/modal) replaced headerHeight with top safe area inset

* feat(carmode/native) removed unused import and fixed linter

* feat(chat/polls/native) reverted style changes

* feat(base/modal) added isModalPresentation default prop

* feat(base/modal) made isModalPresentation optional

* feat(base/modal) headerHeight based on top notch devices

* feat(polls) updated styles

* feat(base/modal) updated comment

React Navigation v6.

Introduce navigation for all in-conference screens.