Do not ignore trait implementation in Odra module

[kpob]

At the moment, if you implement a trait for a module, the defined contract will be ignored.

trait ContractInterface {
  fn name() -> String;
}

#[odra::module]
struct Contract;

#[odra::module]
impl ContractInterface for Contract {
  fn name() -> String;
}

The expanded code would be:

impl Contract {
  fn name() -> String;
}

...
/// Deployer, Ref, etc