docs(database, offline): setPersistence* methods are sync not async (#5887)

* Promise -> Sync: setPersistence*
#5886
`setPeristenceEnabled` and `setPersistenceCacheSizeBytes` are sync calls, which do not return a promise.
Currently the examples expect a promise. This fixes them to expect a sync call.
* fix(database, types): setPersistence* and setLogging are sync

Co-authored-by: Mike Hardy <[email protected]>

Author: stopachka

docs/database/offline-support.md

@@ -19,9 +19,7 @@ as early on in your application code as possible:
 import { AppRegistry } from 'react-native';
 import database from '@react-native-firebase/database';
 
-database()
-  .setPersistenceEnabled(true)
-  .then(() => console.log('Realtime Database persistence enabled'));
+database().setPersistenceEnabled(true);
 
 AppRegistry.registerComponent('app', () => App);
 ```
@@ -93,5 +91,5 @@ little or too much data, call the `setPersistenceCacheSizeBytes` method to updat
 ```js
 import database from '@react-native-firebase/database';
 
-await database().setPersistenceCacheSizeBytes(2000000); // 2MB
+database().setPersistenceCacheSizeBytes(2000000); // 2MB
 ```

packages/database/lib/index.d.ts

@@ -1217,7 +1217,7 @@ export namespace FirebaseDatabaseTypes {
      *
      * @param enabled Whether persistence is enabled for the Database service.
      */
-    setPersistenceEnabled(enabled: boolean): Promise<void>;
+    setPersistenceEnabled(enabled: boolean): void;
 
     /**
      * Sets the native logging level for the database module. By default,
@@ -1237,7 +1237,7 @@ export namespace FirebaseDatabaseTypes {
      *
      * @param enabled Whether debug logging is enabled.
      */
-    setLoggingEnabled(enabled: boolean): Promise<void>;
+    setLoggingEnabled(enabled: boolean): void;
 
     /**
      * By default Firebase Database will use up to 10MB of disk space to cache data. If the cache grows beyond this size,
@@ -1262,7 +1262,7 @@ export namespace FirebaseDatabaseTypes {
      *
      * @param bytes The new size of the cache in bytes.
      */
-    setPersistenceCacheSizeBytes(bytes: number): Promise<void>;
+    setPersistenceCacheSizeBytes(bytes: number): void;
 
     /**
      * Modify this Database instance to communicate with the Firebase Database emulator.