Function wasm_value

The wasm wrapper-API value expression for `mv` of resolved type `ty`, or `None` (skip the whole enclosing type, loudly at the caller) when the shape has no faithful wasm-ctor build.

(
    types: &IntermediateTypes,
    mv: &MintValue,
    ty: &ConceptualRustType,
    scoped: &ScopeMap,
    cli: &Cli,
)