[Bug] @Codable fails in structs with static members.

[Midbin]

In my testing @Codable fails for structs which include static members:

@Codable
struct Test {
  static var test = "test"
}

Fails with Failed to receive result from plugin (from macro 'Codable').

It also fails in all other common permutations (with normal members etc.)

A working workaround for now is to declare these static members in an extension.

[soumyamahunt]

@Midbin do you want to create PR for this?

[Midbin]

I created #37