Create API implementation to allow execute the queries required by consoles

Initially:

Process Instances

• getProcessInstancesByFilter(String filterJson): <ProcessInstance[]>
• getProcessInstanceChildrenByParentId(String parentPInstanceId):<ProcessInstance[]>

Process Instance Details

• getProcessInstanceById(String processInstanceid):<ProcessInstance
• getJobsByProcessInstanceId(String processInstanceId):<Jobs[]>

JobsListApi

• getJobsByFilter(String filterJson): <Jobs[]>

Task Details

• getUserTaskInstanceById(String userTaskId)

Task Inbox:

• getUserTasksByFilter(String filter, String user, String... groups)