created `Arrow` component with `react-native-svg`
Used the [[ https://react-svgr.com/playground/ | React SVGR ]] tool to help build the component with the only modification being that I added the `viewBox` prop and changed the color from `gray` to be the original hex value of `#808080`
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Linear task: [[ https://linear.app/comm/issue/ENG-1779/update-design-for-threads-in-chat-inbox-on-native | ENG-1779 ]]