DebugLogger class made internal in ASP.NET Core 3.0

## DebugLogger class made internal in ASP.NET Core 3.0

DebugLogger has effectively been removed. Previously it was public, but now it is internal to match other logger implementations such as ConsoleLogger.

### Version introduced

3.0

### Old behavior

DebugLogger was public.

### New behavior

DebugLogger is now internal.

### Reason for change

Consistency and reduction of API surface.

### Recommended action

Use the the [AddDebug](https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.logging.debugloggerfactoryextensions.adddebug?view=aspnetcore-3.0) ILoggingBuilder extension method to enable debug logging. [DebugLoggerProvider](https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.logging.debug.debugloggerprovider?view=aspnetcore-3.0) is also still public in the event the service needs to be registered manually.

### Category

ASP.NET Core

### Affected APIs

[DebugLogger](https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.logging.debug.debuglogger?view=aspnetcore-2.2)



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#### Issue metadata

* Issue type: breaking-change

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DebugLogger class made internal in ASP.NET Core 3.0 #14941