Feature Request: Support PATCH Requests in the API

[klcodanr]

Environment details:

• N/A (Cloud Service)

Steps to reproduce the issue:

1. Create an Action (or another entity) via the AIO CLI or REST API
2. Find a necessary use case to update one or more properties, annotations or others on the action
3. The only option is now to PUT a new version of the action including it's code

Provide the expected results and outputs:

The API should support sending a PATCH request in a well-understood format like JSON Patch (rfc6902): http://jsonpatch.com/

Which has a Scalia implementation: https://github.com/gnieh/diffson

For example you could send a PATCH request to /api/v1/actions/[my-action with the body:

[
  { "op": "replace", "path": "/properties/2", "value": {
            "key": "SERVICE_HOST",
            "value": "https://my-sevice.companygateway.io"
        } }
]

Provide the actual results and outputs:

Not Supported

Additional information you deem important: