Add Views argument to filter memberships by Drupal user [#3578558]

Problem/Motivation

I wanted to present a logged in user with the crm_membership entities through Views.
Since crm_membership entities are only directly linked with contacts, and contacts can be mapped to Drupal users via the user contact mapping service, I thought it would make sense to add a helper Views argument plugin to help with that.

Issue fork crm_membership-3578558

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3578558-add-views-argument changes, plain diff MR !8
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