Enable ILogger provider for apps targetting .NET Framework

[cijothomas]

This (microsoft/ApplicationInsights-aspnetcore#853) enables ilogger by default for NETSTANDARD20. The project also targets NET46, and we need to ensure that apps targeting .net framework also should be able to use this change.

[cijothomas]

apps targetting any .net framework dont get the new ilogger yet.

[SergeyKanzhelev]

Change here: https://github.com/microsoft/ApplicationInsights-dotnet/blob/develop/LOGGING/src/ILogger/ILogger.csproj#L3 and make sure everything builds

[cijothomas]

SInce msft.extension.logging is only targetting netstandard2.0, we need to target net461 (or net472) in ilogger to consume it. This means aspnetcore project (which targets net45, net46) should additionally target net461 (or net472) - and enable auto ilogger integration for netstandard20 and net461(or net472).
This makes ilogger integration work well with .net core app targeting netet461 (or net472). We wont support older targets like net45 or net46.

[cijothomas]

2.14.0-beta5 should have this.
Thanks Eddy Nakamura (@eddynaka) and Rajkumar Rangaraj (@rajkumar-rangaraj)