Include document/class information in CollectionWasNotInitialized

[rspring-oncai]

Hi, when CollectionWasNotInitialized is raised here it does not include any information that can be useful for debugging.

Request: please add the document that was not initialized to the exception so it can be used for debugging.

Current:

    @classmethod
    def get_settings(cls) -> DocumentSettings:
        """
        Get document settings, which was created on
        the initialization step

        :return: DocumentSettings class
        """
        if cls._document_settings is None:
            raise CollectionWasNotInitialized
        return cls._document_settings

Proposed (just the idea, I think CollectionWasNotInitialized would need to be updated):

    @classmethod
    def get_settings(cls) -> DocumentSettings:
        """
        Get document settings, which was created on
        the initialization step

        :return: DocumentSettings class
        """
        if cls._document_settings is None:
            raise CollectionWasNotInitialized(cls)
        return cls._document_settings