ConsoleLoggerOptions are not properly stored by ConsoleLoggerProvider

[analogrelay]

As a result, Loggers are only updated with new settings when the options changes, and only the loggers already registered at the time the options are loaded are updated, new loggers get default settings.

This is because the constructor doesn't initialize _settings with the current value: https://github.com/aspnet/Logging/blob/dev/src/Microsoft.Extensions.Logging.Console/ConsoleLoggerProvider.cs#L39

Then when a logger is created, it uses the non-existent _settings which means it falls back to default behavior: https://github.com/aspnet/Logging/blob/dev/src/Microsoft.Extensions.Logging.Console/ConsoleLoggerProvider.cs#L105

/cc @davidfowl @pakrym

@Eilon @muratg This is necessary for RTM and a fairly trivial fix.