Refactor post threads to use react query (#1851)

* Add post and post-thread queries

* Update PostThread components to use new queries

* Move from normalized cache to shadow cache model

* Merge post shadow into the post automatically

* Remove dead code

* Remove old temporary session

* Fix: set agent on session creation

* Temporarily double-login

* Handle post-thread uri resolution errors

src/state/queries/resolve-uri.ts

@@ -0,0 +1,17 @@
+import {useQuery} from '@tanstack/react-query'
+import {AtUri} from '@atproto/api'
+import {useSession} from '../session'
+
+export const RQKEY = (uri: string) => ['resolved-uri', uri]
+
+export function useResolveUriQuery(uri: string) {
+  const {agent} = useSession()
+  return useQuery<string | undefined, Error>(RQKEY(uri), async () => {
+    const urip = new AtUri(uri)
+    if (!urip.host.startsWith('did:')) {
+      const res = await agent.resolveHandle({handle: urip.host})
+      urip.host = res.data.did
+    }
+    return urip.toString()
+  })
+}