Add WriteTo method to DelimitedSyntaxList<T>, IsPresent property, and WriteDelimitedList overloads to SyntaxWriter#15

jonathanvdc merged 4 commits intomainjonathanvdc/MLIR.NET:mainfrom

copilot/add-writeto-method-delimitedsyntaxlistjonathanvdc/MLIR.NET:copilot/add-writeto-method-delimitedsyntaxlistCopy head branch name to clipboard