Adding support for IonQ v0.4 API

[radumarg]

I have been tasked by IonQ team to add support for v0.4 API. The new API is documented here: https://docs.ionq.com/api-reference/v0.4/introduction The old v0.3 API will be removed.

There is a new draft PR here: #3456 which is work in progress.

I have opened a new isssue here: #3457

I need some guidance on implementing the tests. As far as I can see there are C++ tests, Python tests and integration tests. How can I execute integration test locally? Also I am trying to figure our where should I add tests for the changes I am working on. Where can I find some recommendations on this? My biggest concern right now is that I have modified the production code and not the test code and the c++/python tests are still passing. How can I run tests against IonQ simulator not a mock?

[radumarg]

After some struggle I figured out most of the questions