Use Rust tests in wrap-rust template

[krisbitney]

This PR replaces the JS e2e tests in the wrap-rust template with Rust tests. The Rust app bindings are generated and used for the e2e tests to provide a nice UX.

It also adds the Rust app bindings to the CLI, which hadn't been done yet, so codegen works as expected.

[cbrzn]

since in rust you would normally create the tests folder for integration tests (for unit you would do the tests in the same file); what do you think about moving this e2e file to it/module.rs
rather than having:

|_tests/
  |_e2e.rs
  |_types/

we would have:

|_tests/
  |_it/
    |_module.rs
  |_types/

this is more idiomatic imo

[krisbitney]

Done!