Handled crash when subscribing to invalid topic

[hiteshchopra11]

Fix for #32 (comment)

There is a crash when we try to connect to an invalid topic.
For example home# or home+

Steps to reproduce -:

1. Connect to a MQTT broker
2. Subscribe to an invalid topic name. Example home#

Error Logs -:

2022-07-16 13:45:37.778 10608-10647/com.gojek.courier.app E/AndroidRuntime: FATAL EXCEPTION: MQTT_Thread
    Process: com.gojek.courier.app, PID: 10608
    java.lang.IllegalArgumentException: Invalid usage of multi-level wildcard in topic string: home#
        at org.eclipse.paho.client.mqttv3.MqttTopic.validate(MqttTopic.java:200)
        at org.eclipse.paho.client.mqttv3.MqttAsyncClient.subscribe(MqttAsyncClient.java:889)
        at com.gojek.mqtt.connection.MqttConnection.subscribe(MqttConnection.kt:474)
        at com.gojek.mqtt.client.v3.impl.AndroidMqttClient.subscribeMqtt(AndroidMqttClient.kt:465)
        at com.gojek.mqtt.scheduler.runnable.SubscribeRunnable.run(SubscribeRunnable.kt:11)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loopOnce(Looper.java:201)
        at android.os.Looper.loop(Looper.java:288)
        at android.os.HandlerThread.run(HandlerThread.java:67)

Video for your reference

[deepanshu42]

Closes #32