introduce the `ReactionSelectionPopover` component. For the default emojis, I could not fit all the emojis mentioned in the linear task in the popover. So I went with FB messenger's default emojis for now, but we can always change it in the future
Facebook Messengers default emojis:
{F350877}
[[ https://www.figma.com/file/L675ETKDnGaSwlpZAw4MIC/Mobile-App?node-id=3057%3A43013&t=Znc2JH9hFQVDXQ90-4 | Figma ]]
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Depends on D6453
Linear Task: [[ https://linear.app/comm/issue/ENG-2779/introduce-reactionselectionpopover-component | ENG-2779 ]]