Is your feature request related to a problem? Please describe.
If you use the macro on a public protocol declaration from module A and you have a unit test in another module that you'd like to use the protocol spy from module A, you don't have visibility to the Spy in module B since it's declared as internal.

Describe the solution you'd like
The generated spy should use the same access control as the attached protocol's.

Describe alternatives you've considered
You could import the module as testable

Additional context