Implementation of a reference EchoProcess

[francescoingv]

I find it difficult to check if the processor returns an output correctly formatted. Currently only examples with single output of type object and mimetype application/json are available: HelloWorldProcessor echoProcessor (Note: despite what it is declared into the metadata it returns an object of mimetype 'application/json' ).

Describe the solution you'd like I would like to add a module (say echoProcess.py) which can receive several types of input, and copy them to the output. The reference example for the implementation of the inputs and outputs could be the EchoProcess, as reported in Example - Example OGC Process Description in the standard document, on page 72 (after requirement 54 and before §9).

An additional feature of the module should be the possibility to return a reference instead of a value, but this could be a second step.

Additional context Refer also to #1436

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