Data size parameters in application CRD

After reviewing the CRDs shared in this repository from i2CAT, @alejandroi2cat proposed to include the following two parameters related to the size of the data handled by an application to the application CRD (https://gitlab.eclipse.org/eclipse-research-labs/codeco-project/experimentation-framework-and-demonstrations/data-generators-and-datasets/synthetic-data-generator/-/blob/FOR/CRD_examples/acm/codeco-applicationmodel-crd.yaml)

            input_data_size:
              description: estimated size of input data used in the application
              type: integer
            output_data_size:
              description: estimated size of output data of the application
              type: integer

We have also included these two parameters in the Excel file with the parameters list on NextCloud: https://cloud.fortiss.org/index.php/f/116549, but have not modified the CRD in this repository yet pending further confirmation.

@lga please add any other data parameters that you think might be interesting. @rs19104 should we modify the CRD directly in this repository as well?