Expose protocol status and error properties

[yorickdewid]

Private fields are useless, unless you print the structure to debug.

[yorickdewid]

@richardeoin

[richardeoin]

Thanks for the PR @yorickdewid . These structs can also be marked #[non_exhaustive] to avoid breaking user code if more fields are added in future

[bors[bot]]

Build succeeded:

• ci