Add Collect creator data from Europeana API

[dryruffian]

Fixes

Fixes #2834 by @obulat

Description

Added a New method _get_creator in class EuropeanaRecordBuilder to collect cerator data form dcCreator field, which contains the creator information, is now extracted and included in the record data.

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[dryruffian]

Yo @obulat, can you please review this PR? It adds a new method to the EuropeanaRecordBuilder class that collects creator data from the dcCreator field.

[obulat]

This PR is almost there, @dryruffian! There are two points that need to be fixed to make it working correctly.

[obulat]

Suggested change

	"creator": self._get_creator(item_data),
	"creator": self._get_creator(data),

I tested this PR using October 1st as the date. The dcCreator is available in data dictionary, not item_data.

[obulat]

I think it's better to check if the creators is an instance of list or not:

if isinstance(creators, list):
    return ", ".join(creators)
elif isinstance(creators, str):
    return creators
return None

[dryruffian]

thank's @obulat for the suggestion I have updated the code to check creators is an instance of list or not. I have also added also tests for some edge cases

[obulat]

😆