COREP-5570 Add API configuration for RMA and Maximum Conversion

[jorgen-mp]

In checkout request:

	"configuration": {
		"riskManager": {
			"policyGroup": "RM_POLICY_GROUP_1",
			"policy": "RMPolicy1"
		},
		"maxConversion": {
			"policyGroup": "CoversionPolicyGroup1",
			"policy": "CoversionPolicy1"
		}
	},

and response:

	"configuration": {
		"paymentType": "PAYMENT",
		"paymentDisplayType": "SCRIPT",
		"autoCapture": false,
		"riskManager": {
			"policyGroup": "RM_POLICY_GROUP_1",
			"policy": "RMPolicy1"
		},
		"maxConversion": {
			"policyGroup": "CoversionPolicyGroup",
			"policy": "CoversionPolicy1"
		}
	},