stores:
https://github.com/dotnet/aspnetcore/blob/main/src/Identity/Extensions.Core/src/IUserStore.cs
https://github.com/dotnet/aspnetcore/blob/main/src/Identity/Extensions.Core/src/IRoleStore.cs
https://github.com/dotnet/aspnetcore/tree/main/src/Identity/Extensions.Stores/src/UserStoreBase.cs
https://github.com/dotnet/aspnetcore/tree/main/src/Identity/Extensions.Stores/src/RoleStoreBase.cs
https://github.com/dotnet/aspnetcore/tree/main/src/Identity/EntityFrameworkCore/src/UserStore.cs
https://github.com/dotnet/aspnetcore/tree/main/src/Identity/EntityFrameworkCore/src/RoleStore.cs
managers:
https://github.com/dotnet/aspnetcore/blob/main/src/Identity/Extensions.Core/src/UserManager.cs
https://github.com/dotnet/aspnetcore/blob/main/src/Identity/Extensions.Core/src/RoleManager.cs