[native_doc_dartifier] Make the translate prompt more generic

[marshelino-maged]

The Translate prompt currently has detailed instructions that are tied to JNIgen. so whenever JNIgen evolves or changes something in the bindings, for example, using "_" instead of "$" for resolve naming, the instructions will be incorrect and can lead to incorrect results.

We need to make the prompt more generic and less coupled to how JNIgen works.
and more rely on the context given.