Relax AV1555 so that named parameters are permitted when invoking external libraries

The following use of named parameters when invoking `AddApplicationInsights` should be allowed by [AV1555](https://github.com/dennisdoomen/CSharpGuidelines/blob/master/_rules/1555.md)

```
builder.Services.AddLogging(loggingBuilder =>
{
if (!string.IsNullOrWhiteSpace(connectionString))
{
// Enable logging to the Application Insights service.
loggingBuilder.AddApplicationInsights(
configureTelemetryConfiguration: config => config.ConnectionString = connectionString,
configureApplicationInsightsLoggerOptions: options => { }
);
}
});
```

Whether that external library is a package build by the same developer isn't relevant.

See also discussion https://github.com/bkoelman/CSharpGuidelinesAnalyzer/issues/145