DateOnly Output SqlParameter

# Problem
The new `DateOnly` CLR type maps nicely to the SQL `date` for input parameters now, but there is no way for me to tell the sql driver that I want sql `date` output parameters to be `DateOnly`. (Potentially the same with TimeOnly instead of time span).

# Example
## Exec Stored Procedure
```csharp
using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;

namespace Brandon.Expirements
{
public class Program
{
private const string ExecProcCmd = "EXEC test.DateOnlyOutputParam @in, @out OUTPUT";

public static void Main()
{
var ctx = new ExpContext();

var inParam = new SqlParameter("@in", new DateOnly(1996, 06, 27));
var outParam = new SqlParameter()
{
ParameterName = "@out",
Direction = System.Data.ParameterDirection.InputOutput,
DbType = System.Data.DbType.Date,
};

ctx.Database.ExecuteSqlRaw(ExecProcCmd, inParam, outParam);

Console.WriteLine(outParam.Value.GetType().Name); //Logs: DateTime
}
}
}
```

## Stored Procedure
```sql
CREATE PROC [test].[DateOnlyOutputParam] (
@in Date,
@out Date OUTPUT
)
AS
BEGIN
SET @out = @in;
END;
```

# Proposed Solution
It would be nice if there was some kind of configuration flag, or custom converter interface, but I'm not sure where you would put it.
An alternative solution could be using the Value parameter as a hint of what type is expected out. This feels a bit like magic behavior though, more meant as a last resort if configuration isn't an option.
```sql
var outParam = new SqlParameter()
{
ParameterName = "@out",
Direction = System.Data.ParameterDirection.InputOutput,
DbType = System.Data.DbType.Date,
Value = DateOnly.MaxValue, //hints to driver that we want a DateOnly Value
};
```