Export patron's loans to CSV

Purpose: Users need to be able to export loans in CSV format in order to do more complex sorting and filtering, or to show a patron a list of their loans.

Note: This story covers the export function and its appearance/function in the UI. The fields exported will be refined in UIU-630, and the story has been changed to reflect that.

1. Scenario
   • Given the open loan screen
   • When a patron has at least one open loan
   • Display and activate the export function
2. Scenario
   • Given a patron with open loans
   • When a user clicks export on the open loans screen
   • Then the fields available in the Loan API are exported to a CSV file.
     • status.name
     • loanDate
     • dueDate
     • action
     • loanPolicyId
     • metadata.createdDate
     • metadata.createdByUserId
     • metadata.updatedDate
     • metadata.updatedByUserId
     • item.holdingsRecordId
     • item.instanceId
     • item.title
     • item.barcode
     • item.status.name
     • item.location.name
     • item.materialType.name
3. Scenario
   • Given a patron with non-anonymized closed loans
   • When a user clicks export on the closed loans screen
   • Then the fields available in the Loan API are exported to a CSV file
     • status.name
     • loanDate
     • dueDate
     • returnDate
     • systemReturnDate
     • action
     • loanPolicyId
     • metadata.createdDate
     • metadata.createdByUserId
     • metadata.updatedDate
     • metadata.updatedByUserId
     • item.holdingsRecordId
     • item.instanceId
     • item.title
     • item.barcode
     • item.status.name
     • item.location.name
     • item.materialType.name

Implementation note: While this story is specific to exporting loans, we will need the ability to export other types of lists as well in FOLIO (e.g. fees/fines, users, requests). Please consider implementing as a reusable component.