[pigeon] argument name should be transferred to the generated class

[xster]

I started with

@HostApi()
abstract class HostBookApi {
  void finishedEditingBook(Book book);
}

ended Java/Kotlin:

override fun finishedEditingBook(arg: Api.Book?) {
}

Dart:

@override
void displayBookDetails(Book arg) {
}

[xster]

Here's another hopefully simple one. But it is a breaking change so when we do it, we should move the version to 0.3 and add a breaking change note.

[stuartmorgan]

@gaaclarke Was this fixed during the arity changes?

[gaaclarke]

Yep, this got fixed. The argument will now be called "bookArg". It was introduced in 8ea7bec.

[github-actions]

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