title: options.UseOracle() not available in EF Core
body: <p>Using EF Core with Oracle.ManagedDataAccess.Core(2.18.3)</p>
  
  <p>Not able to invoke the "options.UseOracle" method when trying to add DB context.</p>
  
  <p>Compiler throws the error: 'DbContextOptionsBuilder' does not contain a definition for 'UseOracle' and no accessible extension method 'UseOracle' accepting a first argument of type 'DbContextOptionsBuilder' could be found (are you missing a using directive or an assembly reference?)</p>
  
  <p>Please see code below, its the last line that does not compile, My nuget reference includes Oracle.ManagedDataAccess.Core(2.18.3)</p>
  
  <pre><code>using Microsoft.AspNetCore.Builder;
  using Microsoft.AspNetCore.Hosting;
  using Microsoft.AspNetCore.Http;
  using Microsoft.AspNetCore.HttpsPolicy;
  using Microsoft.AspNetCore.Mvc;
  using Microsoft.Extensions.Configuration;
  using Microsoft.Extensions.DependencyInjection;
  using EfGetStarted.AspNetCore.NewDb.Models;
  using Microsoft.EntityFrameworkCore;
  using Oracle.ManagedDataAccess.Client;
  
  namespace EfGetStarted.AspNetCore.NewDb
  {
      public class Startup
      {
          public Startup(IConfiguration configuration)
          {
              Configuration = configuration;
          }
  
          public IConfiguration Configuration { get; }
  
          // This method gets called by the runtime. Use this method to add services to the container.
          public void ConfigureServices(IServiceCollection services)
          {
              services.Configure&lt;CookiePolicyOptions&gt;(options =&gt;
              {
                  // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                  options.CheckConsentNeeded = context =&gt; true;
                  options.MinimumSameSitePolicy = SameSiteMode.None;
              });
  
  
              services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
  
  
  
              var ora_conn = "User Id=xyz;Password=pwd;Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = ORA01)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = ora1)))";
              services.AddDbContext&lt;BloggingContext&gt;(options =&gt; options.UseOracle(ora_conn));
  
  
          }
  </code></pre>