Model for OSF APIv2 file providers. Primarily used in relationship fields. This model is used for basic file provider metadata. To interact with file contents directly, see the file-manager service. For field and usage information, see:

• https://api.osf.io/v2/docs/#!/v2/Node_Providers_List_GET
• https://api.osf.io/v2/docs/#!/v2/Node_Provider_Detail_GET
• https://api.osf.io/v2/docs/#!/v2/Registration_Providers_List_GET