Commits on Nov 25, 2019

1. Another try at simple logging... …

   Fixes #16200
   Fixes #1199
   
   Examples:
   
   Log to the Console:
   
   ```C#
   protected override void OnConfiguring(DbContextOptionsBuilder options)
       => options
   	    .UseMyProvider("...")
   		.LogTo(Console.WriteLine);
   ```
   
   Log to the Console for a given level:
   
   ```C#
   protected override void OnConfiguring(DbContextOptionsBuilder options)
       => options
   	    .UseMyProvider("...")
   		.LogTo(Console.WriteLine, LogLevel.Information));
   ```
   
   Log to the Console for specific events:
   
   ```C#
   protected override void OnConfiguring(DbContextOptionsBuilder options)
       => options
   	    .UseMyProvider("...")
   		.LogTo(Console.WriteLine, new[] { CoreEventId.ContextInitialized, CoreEventId.ContextDisposed }));
   ```
   
   Log to the Console for specific categories:
   
   ```C#
   protected override void OnConfiguring(DbContextOptionsBuilder options)
       => options
   	    .UseMyProvider("...")
   		.LogTo(Console.WriteLine, new[] { DbLoggerCategory.Infrastructure.Name, DbLoggerCategory.Update.Name }));
   ```
   
   Log to the Console with custom filter:
   
   ```C#
   protected override void OnConfiguring(DbContextOptionsBuilder options)
       => options
   	    .UseMyProvider("...")
   		.LogTo(Console.WriteLine, (e, l) => e == CoreEventId.SaveChangesCompleted)));
   ```
   
   Log to the Console for events in specific categories and a given level formatted as a single line using UTC timestamps:
   
   ```C#
   protected override void OnConfiguring(DbContextOptionsBuilder options)
       => options
   	    .UseMyProvider("...")
   		.LogTo(
   		    Console.WriteLine,
   			new[] { DbLoggerCategory.Infrastructure.Name, DbLoggerCategory.Update.Name },
   			LogLevel.Information,
   			SimpleLoggerFormatOptions.SingleLine | SimpleLoggerFormatOptions.DefaultWithUtcTime | ));
   ```

   

   ajcvickers committed Nov 25, 2019
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