WIP: Organization sponsorship flow

src/Core/Models/Api/Request/Organizations/OrganizationSponsorshipRedeemRequestModel.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace Bit.Core.Models.Api
+{
+    public class OrganizationSponsorshipRedeemRequestModel
+    {
+        [Required]
+        public Guid SponsoredOrganizationId { get; set; }
+    }
+}

src/Core/Models/Api/Request/Organizations/OrganizationSponsorshipRequestModel.cs

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+using System;
+using System.ComponentModel.DataAnnotations;
+using Bit.Core.Utilities;
+
+namespace Bit.Core.Models.Api.Request
+{
+    public class OrganizationSponsorshipRequestModel
+    {
+        [Required]
+        public Guid OrganizationUserId { get; set; }
+        [Required]
+        [StringLength(256)]
+        [StrictEmailAddress]
+        public string sponsoredEmail { get; set; }
+    }
+}

src/Core/Models/Table/OrganizationSponsorship.cs

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+using System;
+using Bit.Core.Utilities;
+
+namespace Bit.Core.Models.Table
+{
+    public class OrganizationSponsorship : ITableObject<Guid>
+    {
+        public Guid Id { get; set; }
+        public Guid InstallationId { get; set; }
+        public Guid SponsoringOrganizationId { get; set; }
+        public Guid SponsoringOrganizationUserId { get; set; }
+        public Guid SponsoringUserId { get; set; }
+        public Guid? SponsoredOrganizationId { get; set; }
+        public bool CloudSponsor { get; set; }
+        public DateTime? LastSyncDate { get; set; }
+        public byte TimesRenewedWithoutValidation { get; set; }
+        public DateTime? SponsorshipLapsedDate { get; set; }
+
+        public void SetNewId()
+        {
+            Id = CoreHelpers.GenerateComb();
+        }
+    }
+}