Update to function and events definitions - allow inline array def as…

[tsurdilo]

… well as uri reference to external resource

Signed-off-by: Tihomir Surdilovic tsurdilo@redhat.com

Many thanks for submitting your Pull Request ❤️!

Please specify parts this PR updates:

• [ x] Specification
• [ x] Schema
• Examples
• Usecases
• Extensions
• Roadmap
• Use Cases
• Community
• TCK
• Other

What this PR does / why we need it:

Allows not only existing inline-definitions of functions / events but also to reference external resource (via URI), for example:

1. Workflow definition:

{  
   "id": "sampleWorkflow",
   "version": "1.0",
   "name": "Sample Workflow",
   "description": "Sample Workflow",
   "functions": "http://myhost:8080/functiondefs.json",
   "events": "http://myhost:8080/eventsdefs.json",
   "states":[
     ...
   ]
}

2. Function definitions resource (functiondefs.json)

{
   "functions": [
      {
         "name":"HelloWorldFunction",
         "resource":"https://hellworldservice.test.com:8443/api/hellofunction"
      }
   ]
}

3. Event definitions resource (eventsdefs.json)

{
   "events": [
      {  
         "name": "ApplicantInfo",
         "type": "org.application.info",
         "source": "applicationssource",
         "correlation": [
          { 
            "contextAttributeName": "applicantId"
          } 
         ]
      }
   ]
}

[ricardozanini]

That's nice!