Function wasmtime_component_instance_get_export_index 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn wasmtime_component_instance_get_export_index(
    instance: &Instance,
    context: WasmtimeStoreContextMut<'_>,
    instance_export_index: *const wasmtime_component_export_index_t,
    name: *const u8,
    name_len: usize,
) -> Option<Box<wasmtime_component_export_index_t>>