Add more support for some configuration methods

[tsimbalar]

This is the equivalent to serilog/serilog#1194

There is no reason not to support the following methods in key-value settings provider :

• WriteTo.Sink(ILogEventSink logEventSink, LogEventLevel restrictedToMinimumLevel = LevelAlias.Minimum, LoggingLevelSwitch levelSwitch = null)
• AuditTo.Sink(ILogEventSink logEventSink, LogEventLevel restrictedToMinimumLevel = LevelAlias.Minimum, LoggingLevelSwitch levelSwitch = null)
• Enrich.With(params ILogEventEnricher[] enrichers) (with surrogate Enrich.With(ILogEventEnricher enricher) )
• Filter.With(params ILogEventFilter[] filters) (with surrogate Enrich.With(ILogEventFilter filter) )

The parameters that are an interface can be provided either by specifying the qualified type name of an implementing class that has a default constructor, or referencing a static property/field (see #71 , #73 ).