message: implement wasi check
diff: -use wasmer_runtime_core::{module::Module, vm::Ctx};
  +use wasmer_runtime_core::module::Module;
  -// Cargo culting this from our emscripten implementation for now, but it seems like a
  -// good thing to check; TODO: verify this is useful
  +/// Check if a provided module is compiled with WASI support
  pub fn is_wasi_module(module: &Module) -> bool {
  - true
  - // TODO:
  + for (_, import_name) in &module.info().imported_functions {
  + let namespace = module
  + .info()
  + .namespace_table
  + .get(import_name.namespace_index);
  + if namespace == "wasi_unstable" {
  + return true;
  + }
  + }
  + false
  }
  