Write chat declaration record in response to different events (#10216)

Co-authored-by: Eric Bailey <git@esb.lol>

src/state/queries/messages/actor-declaration.ts

@@ -1,4 +1,8 @@
-import {type AppBskyActorDefs} from '@atproto/api'
+import type AtpAgent from '@atproto/api'
+import {
+  type AppBskyActorDefs,
+  type ChatBskyActorDeclaration,
+} from '@atproto/api'
 import {useMutation, useQueryClient} from '@tanstack/react-query'
 
 import {logger} from '#/logger'
@@ -78,3 +82,21 @@ export function useDeleteActorDeclaration() {
     },
   })
 }
+
+export async function fetchActorDeclarationRecord({
+  agent,
+  did,
+}: {
+  agent: AtpAgent
+  did?: string
+}) {
+  if (!did) return
+  const res = await agent.com.atproto.repo
+    .getRecord({
+      repo: did,
+      collection: 'chat.bsky.actor.declaration',
+      rkey: 'self',
+    })
+    .catch(_e => undefined)
+  return res?.data.value as ChatBskyActorDeclaration.Main
+}