Split composer into smaller components (#5941)

* Extract ComposerTopBar

* Rename state variables to align with props

* Extract ComposerEmbeds

* Extract ComposerPills

* Extract ComposerFooter

* Tweak condition to be simpler

* Extract ComposerPost

src/view/com/composer/text-input/TextInput.tsx

@@ -45,7 +45,7 @@ interface TextInputProps extends ComponentProps<typeof RNTextInput> {
   placeholder: string
   setRichText: (v: RichText) => void
   onPhotoPasted: (uri: string) => void
-  onPressPublish: (richtext: RichText) => Promise<void>
+  onPressPublish: (richtext: RichText) => void
   onNewLink: (uri: string) => void
   onError: (err: string) => void
 }