EOSC COntext Tagging #231

This PR regards the addition of the eosc context to results hostedby datasources registered in the eosc. At the moment the collectedfrom information is not taken into consideration.

The first step is a query at the database to collect the master (deduplicate representative) of the eosc datasources (those with namespace prefix starting with eosc) to create a correspondence (datasource id, master openaireid).

Then the master openaireid is used to search in the result.instance[].hostedby element, i.e. the datasource hosting the research product among each of its instances.

When one is found equal to the master for the datasources registered in the eosc, then the tag is added among the result.context[] if not already present.

This PR regards the addition of the eosc context to results hostedby datasources registered in the eosc. At the moment the collectedfrom information is not taken into consideration. The first step is a query at the database to collect the master (deduplicate representative) of the eosc datasources (those with namespace prefix starting with eosc) to create a correspondence (datasource id, master openaireid). Then the **master openaireid** is used to search in the `result.instance[].hostedby` element, i.e. the datasource hosting the research product among each of its instances. When one is found equal to the master for the datasources registered in the eosc, then the tag is added among the `result.context[]` if not already present.

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EOSC COntext Tagging #231

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