[RGen] Add factory method needed to create a aux variable for a BindFrom(typeof(NSNumber)).

[mandel-macaque]

This change allows to be able to generate an aux variable that will be needed if a customer defined a export method in the following way:

[Export<Method> ()]
public virtual partial void MyMethod ([BindFrom (typeof (NSNumber))] double myDouble);

The above binding API indicates that the native method in objc will take a NSNumber but we want to expose our users a double. In order to send a NSNumber to objc, we need to declare an aux variable that will be used for the native method invocation.

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✅ API diff for current PR / commit

.NET ( No breaking changes )

• iOS: vsdrops gist ( No breaking changes )
• tvOS: vsdrops gist ( No breaking changes )
• MacCatalyst: vsdrops gist ( No breaking changes )
• macOS: vsdrops gist ( No breaking changes )

❗ API diff vs stable (Breaking changes)

.NET ( ❗ Breaking changes ❗ )

• iOS: vsdrops gist ( ❗ Breaking changes ❗ )
• tvOS: vsdrops gist ( ❗ Breaking changes ❗ )
• MacCatalyst: vsdrops gist ( ❗ Breaking changes ❗ )
• macOS: vsdrops gist ( ❗ Breaking changes ❗ )

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

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[StephaneDelcroix]

you never ever feed the generated files in customers partial classes, right ? and you 100% control the typename and the namespace ? otherwise, it's safer to fullyqualify type names in sourcegen'd code

[mandel-macaque]

You have a point. I'll do a second pass to do a fully qualified version of all the different types, I'll create a bug for it so that we use global:: etc

Better safe than sorry.