jextract: Initial typealias handling#714
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resolves #338
We handle type aliases by resolving them to the actual nominal; This is unlike the "specialization" with typealiases where we actually form a new type when the left side has no generics, but the right side binds some.
This is usually what we want, the typealias still points to the same type in the generated Java.
We could go more fancy and try to record "it was a typealias" in docs etc, but we don't for now.