feat!: enforces payload.init is async

* Run connectMongoose before starting payload init

* - reverted changes
- added deprecated to init
- docs: changed all payload.init to payload.initAsync
- changed all internal init calls

* forgotten inits in docs

* reverted back - removed init and renamed initAsync to init

test/devServer.ts

@@ -5,7 +5,7 @@ import payload from '../src';
 
 const expressApp = express();
 const init = async () => {
-  await payload.initAsync({
+  await payload.init({
     secret: uuid(),
     mongoURL: process.env.MONGO_URL || 'mongodb://localhost/payload',
     express: expressApp,

test/helpers/configHelpers.ts

@@ -40,7 +40,7 @@ export async function initPayloadTest(options: Options): Promise<{ serverURL: st
     initOptions.express = express();
   }
 
-  await payload.initAsync(initOptions);
+  await payload.init(initOptions);
 
   if (initOptions.express) {
     initOptions.express.listen(port);