User defined endpoint mediator

[ggianoglio]

With this update, any user can publish an API with a custom mediator that authenticate the endpoint. The mediator must be deployed as JAR in the API manager instance.

The user can publish the API with Publisher API (https://localhost:9443/api/am/publisher/v4/apis) passing the custom endpoint security configuration

      "endpoint_security": {
            "sandbox": {
                "type": "userDefined",
                "enabled": true,
                "customParameters": {
                    "parameter": "value",
                    "boolparameter": true,
[...]
                }
            }
        }

In this case, the sandbox endpoint is secured by the user defined mediator with the specified parameters.

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