[AC-1751] AC Team code ownership moves: OrganizationUser (part 1) (#3487)

* Move OrganizationUser domain to AC Team ownership

* Namespaces will be updated in a separate commit

src/Core/AdminConsole/OrganizationFeatures/OrganizationUsers/Interfaces/IAcceptOrgUserCommand.cs

@@ -0,0 +1,18 @@
+using Bit.Core.Entities;
+using Bit.Core.Services;
+
+namespace Bit.Core.OrganizationFeatures.OrganizationUsers.Interfaces;
+
+public interface IAcceptOrgUserCommand
+{
+    /// <summary>
+    /// Moves an OrganizationUser into the Accepted status and marks their email as verified.
+    /// This method is used where the user has clicked the invitation link sent by email.
+    /// </summary>
+    /// <param name="emailToken">The token embedded in the email invitation link</param>
+    /// <returns>The accepted OrganizationUser.</returns>
+    Task<OrganizationUser> AcceptOrgUserByEmailTokenAsync(Guid organizationUserId, User user, string emailToken, IUserService userService);
+    Task<OrganizationUser> AcceptOrgUserByOrgSsoIdAsync(string orgIdentifier, User user, IUserService userService);
+    Task<OrganizationUser> AcceptOrgUserByOrgIdAsync(Guid organizationId, User user, IUserService userService);
+    Task<OrganizationUser> AcceptOrgUserAsync(OrganizationUser orgUser, User user, IUserService userService);
+}