Adds support for logging NodaTime types with Serilog.

Configure Serilog to support NodaTime types by calling .ConfigureForNodaTime on the LoggerConfiguration instance:

.ConfigureForNodaTime(DateTimeZoneProviders.Tzdb)

For example:

var logger = new LoggerConfiguration()
                .ConfigureForNodaTime(DateTimeZoneProviders.Tzdb)
                .WriteTo.Console(outputTemplate: "{Instant} {Message:lj}")
                .CreateLogger();

Please refer to the example program.