Resources can have a date that they joined or left a package (access_start and access_end dates respectively). The current content of a package should only be considered to be the resources that have an access_start date in the past (or empty) or an access_end date in the future (or empty).
By default the user should only ever see the list of current resources in a package in the UI and exports.
This story is to implement appropriate filters so that only current content of a package is displayed by default
Out of scope is viewing the lists of resources that previously were part of a package (but have now left) or are schedule to join a package in the future (these other filters are the subject of