fix typescript types everywhere, delete pool.js and refactor relay.js to use event listeners everywhere.

keys.ts

@@ -0,0 +1,10 @@
+import * as secp256k1 from '@noble/secp256k1'
+import {Buffer} from 'buffer'
+
+export function generatePrivateKey(): string {
+  return Buffer.from(secp256k1.utils.randomPrivateKey()).toString('hex')
+}
+
+export function getPublicKey(privateKey: string): string {
+  return Buffer.from(secp256k1.schnorr.getPublicKey(privateKey)).toString('hex')
+}