[ODS-5622] Make the ODSStartup configurable

[semalaiappan]

Update EdFi.Ods.WebApi project Appsettings as :"StartUpClassName": "CustomStartup"

Add below CustomStartup class for testing this change

using Autofac;
using EdFi.Ods.Api.Startup;
using EdFi.Ods.Common.Configuration;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;

namespace EdFi.Ods.WebApi
{
public class CustomStartup : OdsStartupBase
{
public CustomStartup(IWebHostEnvironment env, IConfiguration configuration) : base(env, configuration)
{
}

    public override void ConfigureServices(IServiceCollection services)
    {
        base.ConfigureServices(services);

    }

    public override void ConfigureContainer(ContainerBuilder builder)
    {
        base.ConfigureContainer(builder);
    }
    
    public override void Configure(
        IApplicationBuilder app,
        IWebHostEnvironment env,
        IOptions<ApiSettings> apiSettingsOptions,
        IApplicationConfigurationActivity[] configurationActivities)
    {
        base.Configure(app, env, apiSettingsOptions, configurationActivities);
    }
}

}