public Builder vendorParams(ObjectNode vendorParams) {
            this.vendorParams = vendorParams;
            return this;
        }
Sets vendor-specific parameters for the test case which can be used to
influence the request.

<p>If {@link #vendorParamsShape(ShapeId)} is set, these parameters must
match that shape's definition.

@param vendorParams Vendor-specific parameters for the test case.
@return Returns the builder.
smithy-smoke-test-traits/src/main/java/software/amazon/smithy/smoketests/traits/SmokeTestCase.java