INTL0003 triggers on generated main methods

[Keboo]

Create a new minimal API ASP.NET Core project.
Observed: The analyzer triggers on the generated main method.

I suggest we make the analyzer ignore all methods that do not start with a letter or underscore (Full language spec here: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/lexical-structure#643-identifiers)