wrap-java: Avoid generic parameter shadowing

[sidepelican]

This PR addresses #169.

Problem

It is difficult to find guaranteed unique names for generic parameters across inheritance hierarchies and enclosing classes.
This is because subclasses or nested types may remap their own generic parameters recursively.

Approach

This PR implements a simple but effective workaround for #169 using the following hack.

class A<T> {
    // NG
    func foo<T>() -> T? { nil }
}

class B<EscapedT> {
    typealias T = EscapedT
    // OK
    func foo<T>() -> T? { nil }
}

I prefix generic parameter names with their class name. This ensures uniqueness in most cases without requiring complex tree traversal.
I also use a typealias to avoid shadowing warnings. It is somewhat hacky, but effective.

[ktoso]

I like this, agreed that a bit "hacky" but overall pretty good idea. Doing numbering like T1 etc would be a pain to maintain and why I've not gotten to this still... this is way easier to maintain and we do the type alias even as well... Sounds good to me!

This made it just in time for the 0.1.0 tag which I'll do today! 🥳