Reduce the verbose metadata on Salesforce models

There are lot of metadata properties on the Salesforce models that are like

teiid_sf:Calculated" 'false', 
teiid_sf:Custom" 'false', 
teiid_sf:Defaulted on Create" 'true'

that are defined on the model, however they are never used by the engine to further process the queries. Thus these are effectively more of annotations then processing instructions for Teiid engine. These in some situations exceeding the limits of the metadata repository.

Provide an option to not include these in metadata based on a flag