feat(user): add user invitation functionality and enhance OTP verification

- Introduced UserInvitation entity and updated IApplicationDbContext to include UserInvitations DbSet.
- Enhanced VerifyOtpTokenCommand and its handler to support optional inviter mobile number for user registration.
- Added new Protobuf definitions for GetMyInvitees and GetInvitationsByFilter RPCs to manage user invitations.
- Updated UserService to implement methods for retrieving invitees and invitations based on filters.
- Bumped Protobuf project version to reflect the addition of new features.

src/CMSMicroservice.Application/Common/Interfaces/IApplicationDbContext.cs

@@ -21,6 +21,7 @@ public interface IApplicationDbContext
     DbSet<Product> Products { get; }
     DbSet<ProductImage> ProductImages { get; }
     DbSet<User> Users { get; }
+    DbSet<UserInvitation> UserInvitations { get; }
     DbSet<OtpToken> OtpTokens { get; }
     DbSet<Contract> Contracts { get; }
     DbSet<UserContract> UserContracts { get; }