Add new RESTful API for retrieving application

Situation:

Currently, the path format of retrieving application is /ws/v1/partition/{partitionName}/queue/{queueName}/application/{appId}.
We have to give 3 parameters (partitionName, queueName & appID) to fetch application information. But one application can only be submitted to one queue and PartitionContext stores all applications. It means that we can fetch the target application without queue name.

Proposal:

As we have discussed in slack, we can add the following 2 RESTful API.

1. /ws/v1/partition/{partitionName}/applications/{type}
   aim to list applications IDs via the types: rejected, running and completed
2. /ws/v1/partition/{partitionName}/application/{applicationID} 
   aim to retrieving one application object directly.