prefer_generic_function_type_aliases

Use the generic function type syntax in 'typedef's.

The analyzer produces this diagnostic when a typedef is written using the older syntax for function type aliases in which the name being declared is embedded in the function type.

The following code produces this diagnostic because it uses the older syntax:

typedef void F<T>();

Rewrite the typedef to use the newer syntax:

typedef F<T> = void Function();

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