Support IReadOnlyList for Complex Collections

### What problem are you trying to solve?

It can be useful to expose collection navigation properties as IReadOnlyList to prevent client code from adding to the list directly. Instead a method is available that can do some validation and then add to the list (private property) directly. For example:

```csharp
using Microsoft.EntityFrameworkCore;

const string connectionString = "Server=localhost;Database=complex-issues;Port=5432;User Id=postgres;Password=postgres;Include Error Detail=true";
var options = new DbContextOptionsBuilder()
.UseNpgsql(connectionString)
.Options;
var dbContext = new AppDbContext(options);
await dbContext.Database.EnsureDeletedAsync();
await dbContext.Database.EnsureCreatedAsync();

public class Entity
{
public Guid Id { get; init; }
private List _complexEntities = [];
public IReadOnlyList ComplexEntities => _complexEntities.AsReadOnly();

public void AddComplexEntity(ComplexEntity complexEntity)
{
//Some validation
_complexEntities.Add(complexEntity);
}
}

public class ComplexEntity
{
public required string Value { get; init; }
}

public class AppDbContext(DbContextOptions options) : DbContext(options)
{
public DbSet Entities { get; init; }

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity().ComplexCollection(entity => entity.ComplexEntities).ToJson();
}
}
```

This scenario is supported when using `OwnsMany(...).ToJson()`, but when converting to ComplexCollection we receive the following exception:

```
System.InvalidOperationException: The complex collection 'Entity'.'ComplexEntities' is of type 'IReadOnlyList' which does not implement 'IList'.
```

### Describe the solution you'd like

For this scenario to work, so it's easier to convert from Owned entities to Complex entities