Is it possible to pull EnsureSuccessStatusCodeAsync into the IApiResponse<T> interface?

[rwwilden]

Before I create a PR I'd like to know if there's any objection to doing this that I might overlook. I just switched to 6.x and ran into this issue.

Is your feature request related to a problem? Please describe.
For unit testing scenarios it would be much easier if my methods exposed IApiResponse<T> instead of ApiResponse<T>. It would make mocking the response a lot easier.

However, at quite a few locations I call EnsureSuccessStatusCodeAsync on the return value of API calls. This only exists on ApiResponse<T>, meaning it's impossible to switch all my methods to IApiResponse<T>.

Describe the solution you'd like
Pull EnsureSuccessStatusCodeAsync into the IApiResponse<T> interface.

Describe alternatives you've considered
Leave as is, making my unit tests a little more convoluted because creating an ApiResponse<R> there now also requires a RefitSettings.

Describe suggestions on how to achieve the feature
PR to pull method into interface plus maybe a couple tests (haven't looked into that).

[rwwilden]

Ok, I think I found the objection to doing this :)

ApiException depends on HttpResponseMessage which isn't exposed in IApiResponse. Exposing that would probably mean a major departure from what Refit attempts to accomplish?