turn .publish() into a normal async function returning a promise.

this simplifies the code and makes the API more intuitive.

we used to need the event emitter thing because we were subscribing to the same relay
to check if the event had been published, but that is not necessary now that we assume
an OK response will always come.

closes https://github.com/nbd-wtf/nostr-tools/issues/262

nip42.ts

@@ -17,7 +17,9 @@ export const authenticate = async ({
 }: {
   challenge: string
   relay: Relay
-  sign: <K extends number = number>(e: EventTemplate<K>) => Promise<Event<K>> | Event<K>
+  sign: <K extends number = number>(
+    e: EventTemplate<K>
+  ) => Promise<Event<K>> | Event<K>
 }): Promise<void> => {
   const e: EventTemplate = {
     kind: Kind.ClientAuth,
@@ -28,15 +30,5 @@ export const authenticate = async ({
     ],
     content: ''
   }
-  const pub = relay.auth(await sign(e))
-  return new Promise((resolve, reject) => {
-    pub.on('ok', function ok() {
-      pub.off('ok', ok)
-      resolve()
-    })
-    pub.on('failed', function fail(reason: string) {
-      pub.off('failed', fail)
-      reject(reason)
-    })
-  })
+  return relay.auth(await sign(e))
 }