feat(consumer): add top-level socketState getter

Author: egasimus

index.d.ts

@@ -37,6 +37,8 @@ declare class ChainlinkDataStreamsConsumer extends EventEmitter {
       interval?: number;
     };
   });
+  get socketState ():
+    WebSocket["readyState"]|null;
   fetchFeed(args: { timestamp: string | number; feed: string; }):
     Promise<Report>;
   fetchFeeds(args: { timestamp: string | number; feeds: string[]; }):

src/client.js

@@ -45,6 +45,9 @@ export class ChainlinkDataStreamsConsumer extends EventEmitter {
   unsubscribeFrom (feeds) {
     return this.socket.unsubscribeFrom(feeds);
   }
+  get socketState () {
+    return this.socket?.readyState ?? null;
+  }
   get feeds () {
     return this.socket.feeds;
   }