[native] introduce reaction selection popover component
Summary:
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. Also will be cleaning up the animation in a subsequent diff
Facebook Messengers default emojis:
Depends on D6487
Linear Task: ENG-2779
Test Plan:
Please watch the demo video to see what the reaction selection popover component looks like
Reviewers: tomek, atul
Reviewed By: tomek
Subscribers: ashoat, tomek, atul
Differential Revision: https://phab.comm.dev/D6454