feat: cleaner auth state management

1. removes the "auth-state.update" event since it was bloated and fairly unnecessary
2. adds "creds.update" event that only sends the updated properties of the auth credentials
3. ensure the auth creds are not mutated anywhere, but only with the "creds.update" event
4. Separates the signal credentials from the auth credentials (kinda in progress)
5. in memory key store requires a save function to let one know when to save the keys

!BREAKING_CHANGE

src/Types/Auth.ts

@@ -16,12 +16,16 @@ export type SignalIdentity = {
 
 export type LTHashState = { version: number, hash: Buffer, mutations: ChatMutation[] }
 
-export type AuthenticationCreds = {
-    noiseKey: KeyPair
-    signedIdentityKey: KeyPair
-    signedPreKey: SignedKeyPair
-    registrationId: number
-    advSecretKey: string
+export type SignalCreds = {
+    readonly signedIdentityKey: KeyPair
+    readonly signedPreKey: SignedKeyPair
+    readonly registrationId: number
+}
+
+export type AuthenticationCreds = SignalCreds & {
+    readonly noiseKey: KeyPair
+    readonly advSecretKey: string
+    
     me?: Contact
     account?: proto.IADVSignedDeviceIdentity
     signalIdentities?: SignalIdentity[]
@@ -49,6 +53,11 @@ export type SignalKeyStore = {
     setAppStateSyncVersion: (id: WAPatchName, item: LTHashState) => Awaitable<void>
 }
 
+export type SignalAuthState = {
+    creds: SignalCreds
+    keys: SignalKeyStore
+}
+
 export type AuthenticationState = {
     creds: AuthenticationCreds
     keys: SignalKeyStore

src/Types/index.ts

@@ -11,7 +11,7 @@ import type { Logger } from "pino"
 import type { URL } from "url"
 import type NodeCache from 'node-cache'
 
-import { AuthenticationState } from './Auth'
+import { AuthenticationState, AuthenticationCreds } from './Auth'
 import { Chat, PresenceData } from './Chat'
 import { Contact } from './Contact'
 import { ConnectionState } from './State'
@@ -96,8 +96,8 @@ export type CurveKeyPair = { private: Uint8Array; public: Uint8Array }
 export type BaileysEventMap = {
     /** connection state has been updated -- WS closed, opened, connecting etc. */
 	'connection.update': Partial<ConnectionState>
-    /** auth state updated -- some pre keys, or identity keys etc. */
-    'auth-state.update': AuthenticationState
+    /** credentials updated -- some metadata, keys or something */
+    'creds.update': Partial<AuthenticationCreds>
     /** set chats (history sync), messages are reverse chronologically sorted */
     'chats.set': { chats: Chat[], messages: WAMessage[] }
     /** upsert chats */