Port poe messaging to JS

poe_graphql/ViewerStateUpdatedSubscription.graphql

@@ -0,0 +1,43 @@
+subscription viewerStateUpdated {
+  viewerStateUpdated {
+    id
+    ...ChatPageBotSwitcher_viewer
+  }
+}
+
+fragment BotHeader_bot on Bot {
+  displayName
+  messageLimit {
+    dailyLimit
+  }
+  ...BotImage_bot
+}
+
+fragment BotImage_bot on Bot {
+  image {
+    __typename
+    ... on LocalBotImage {
+      localName
+    }
+    ... on UrlBotImage {
+      url
+    }
+  }
+  displayName
+}
+
+fragment BotLink_bot on Bot {
+  displayName
+}
+
+fragment ChatPageBotSwitcher_viewer on Viewer {
+  availableBots {
+    id
+    messageLimit {
+      dailyLimit
+    }
+    ...BotLink_bot
+    ...BotHeader_bot
+  }
+  allowUserCreatedBots: booleanGate(gateName: "enable_user_created_bots")
+}