feat(wsdl-meta): allow to customize message names for operation

[Yozer]

I have several SOAP services and they generate different message names for operations.
This PR extends SoapCore so users can customize the input/output messages in whatever way they want.

[andersjonsson]

I'm thinking that this should be used in MetaWCFBodyWriter also. Thoughts?

[Yozer]

Yep, definitely someone might want to customize it for WCF.
I'm not that familiar with the WCFBodyWriter as I only care about the MetaBodyWriter.
I assume we would need a different implementation there as the default names are probably different?

[andersjonsson]

As far as I can tell it's the same?

SoapCore/src/SoapCore/Meta/MetaWCFBodyWriter.cs

Lines 990 to 1037 in dbc8525

	private void AddMessages(XmlDictionaryWriter writer)
	{
	foreach (var operation in _service.Operations)
	{
	// input
	writer.WriteStartElement("wsdl", "message", Namespaces.WSDL_NS);
	writer.WriteAttributeString("name", $"{BindingType}_{operation.Name}_InputMessage");
	writer.WriteStartElement("wsdl", "part", Namespaces.WSDL_NS);
	writer.WriteAttributeString("name", "parameters");
	string inputElement = "tns:" + operation.Name;
	if (operation.Contract.Name != BindingType)
	{
	var ns = $"q{_namespaceCounter++}";
	writer.WriteXmlnsAttribute($"{ns}", operation.Contract.Namespace);
	inputElement = $"{ns}:{operation.Name}";
	}
	writer.WriteAttributeString("element", inputElement);
	writer.WriteEndElement(); // wsdl:part
	writer.WriteEndElement(); // wsdl:message
	// output
	if (!operation.IsOneWay)
	{
	writer.WriteStartElement("wsdl", "message", Namespaces.WSDL_NS);
	writer.WriteAttributeString("name", $"{BindingType}_{operation.Name}_OutputMessage");
	writer.WriteStartElement("wsdl", "part", Namespaces.WSDL_NS);
	writer.WriteAttributeString("name", "parameters");
	string outputElement = "tns:" + operation.Name + "Response";
	if (operation.Contract.Name != BindingType)
	{
	var ns = $"q{_namespaceCounter++}";
	writer.WriteXmlnsAttribute($"{ns}", operation.Contract.Namespace);
	outputElement = $"{ns}:{operation.Name}Response";
	}
	writer.WriteAttributeString("element", outputElement);
	writer.WriteEndElement(); // wsdl:part
	writer.WriteEndElement(); // wsdl:message
	}
	AddMessageFaults(writer, operation);
	}
	}

BindingType is confusingly named. It's set to service.GeneralContract.Name in the constructor

[Yozer]

Added support for MetaWCFBodyWriter

[andersjonsson]

Looks good! Thank you!