fix: Pass null for Context method arguments in JaxRsRequestHandlerProxy

[nicolatimeus]

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Brief description of the PR. [e.g. Added null check on object to avoid NullPointerException]

Currently the JaxRsRequestHandlerProxy supports at most a single parameter per REST endpoint method.

Methods that use arguments annotated with the Context annotation to receive for example the HttpServletRequest/HttpServletResponse/ContainerRequestContext associated with the current request are not supported.

This PR changes JaxRsRequestHandlerProxy so that it passes null as value for that arguments, since the injected classes are in most cases HTTP specific and it is difficult to provide an equivalent in case of MQTT connection.

• Fixes the service listing REST API not working over MQTT.