Shadow refactoring and improvements (#1959)

* Make shadow a type-only concept

* Prevent unnecessary init state recalc

* Use derived state instead of effects

* Batch emitter updates

* Use object first seen time instead of dataUpdatedAt

* Stop threading dataUpdatedAt through

* Use same value consistently

src/view/screens/ModerationBlockedAccounts.tsx

@@ -40,7 +40,6 @@ export const ModerationBlockedAccounts = withAuthRequired(
     const [isPTRing, setIsPTRing] = React.useState(false)
     const {
       data,
-      dataUpdatedAt,
       isFetching,
       isError,
       error,
@@ -95,7 +94,6 @@ export const ModerationBlockedAccounts = withAuthRequired(
         testID={`blockedAccount-${index}`}
         key={item.did}
         profile={item}
-        dataUpdatedAt={dataUpdatedAt}
       />
     )
     return (