EF.Functions.ILike does not work with InMemoryDatabase

EF.Functions.ILike does not work as expected with InMemoryDatabase:

```
dbContext.Users.Add(new User("username"));
dbContext.Users.Where(u => EF.Functions.ILike(u.Username, $"%username%")).Count(); //=> 1
dbContext.Users.Where(u => EF.Functions.ILike(u.Username, $"%useRname%")).Count(); //=> 0
```