Add translations for NodaTime LocalDate.AtMidnight() and At() #3576

The LINQ expression 'DbSet<TestEntity>()
    .Where(t => t.Date.AtMidnight().Hour > 0)' could not be translated. Additional information: Translation of method 'NodaTime.LocalDate.AtMidnight' failed.

[Fact]
public void LocalDateTests()
{
    const string connString = "Host=localhost;Database=NodaTimeTests;Username=postgres;Password=postgres";

    var options = new DbContextOptionsBuilder<TestDbContext>()
        .UseNpgsql(connString, b => b.UseNodaTime())
        .Options;

    using var context = new TestDbContext(options);
    context.Database.EnsureCreated();

    // Succeeds
    _ = context.Set<TestEntity>()
        .Select(e => e.Date.AtMidnight().Hour > 0)
        .ToList();

    // Fails
    _ = context.Set<TestEntity>()
        .Where(e => e.Date.AtMidnight().Hour > 0)
        .ToList();
}

private class TestDbContext(DbContextOptions options) : DbContext(options)
{
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<TestEntity>();
    }
}

public class TestEntity
{
    public int Id { get; init; }

    public LocalDate Date { get; init; }
}