* Added nullable OrganizationId to EventModel
* Added EventType Organization_ClientExportedVault
* Updated CollectController to save the event Organization_ClientExportedVault
* Added OrganizationExportResponseModel to encapsulate Organization Export data
* Added OrganizationExportController to have a single endpoint for Organization vault export
* Added method GetOrganizationCollections to ICollectionService to get collections for an organization
* Added GetOrganizationCiphers to ICipherService to get ciphers for an organization
* Updated controllers to use new methods in ICollectionService and ICipherService
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