Allow exporting view mode for entity reference [#3538566]

Problem/Motivation

Export view mode for Entity reference.
Add choice to export view mode of existing bundle for entities.
Add entity_reference_revision for Paragraph field.

Proposed resolution

Add a view mode option on configuration export form and render the corresponding view mode of the linked entity when exporting.

Also add the possibility to use the plugin on entity_reference_revision in the same way.

Add PHP_EOL separator for multivalued value.

Issue fork entity_export_csv-3538566

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3538566-allow-exporting-viewmode changes, plain diff MR !8
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