wit-dylib: Generate helper functions during lifting/lowering #2308
Description
Right now each adapter generates one monolithic wasm function per world import and world export. This means that if a list<T> is used many times, it'll have duplicated lowering/lifting code in many places. Should consider splitting out helpers to, for example, read T from linear memory (or write it) and delegate to those helpers instead. Some discussion here about this too.