Check for concurrent updates.

[mgernand]

Add an interface IProvideConcurrencyStampwhich provide a string property ConcurrencyStamp.
The repositories then need to update the stamp on every update and must throw if the entity was changed in the meantime.

See: https://github.com/mgernand/AspNetCore.Authorization.Permissions/blob/c894d393dd4d7ed4f857df48f27177dde7c7bd99/src/AspNetCore.Identity.Permissions.MongoDB/TenantStore.cs#L115

https://github.com/mgernand/AspNetCore.Authorization.Permissions/blob/c894d393dd4d7ed4f857df48f27177dde7c7bd99/src/AspNetCore.Identity.Permissions.EntityFrameworkCore/TenantStore.cs#L139