Add retry behaviour

[estahn]

Is your feature request related to a problem? Please describe.

Connections and API responses are flakey at times. A built-in retry mechanism could improve the success of responses.

Describe the solution you'd like

Use https://github.com/jd/tenacity (or similar) to add retry-behaviour.

[dbanty]

I'm going to consider #775 as fixing this since you will be able to use the built-in httpx retries as well as reuse client connections when doing other retries (a la tenacity). I think retries tend to be super specific to each use-case, so adding a default opinionated mechanism in every client probably won't be super useful.

[imadmoussa1]

The httpx retries only manage connection failure . will we be considering adding something more custom httpx retry requests to the generator ?

[dbanty]

@imadmoussa1 I think desired retry behavior is going to depend a lot on the application and the API—I'd assume that most folks creating SDKs for an API would like to build in their recommended retry behavior 🤔. If there's enough demand for it, we could add some sort of retry config for certain responses (specifically, those which include a Retry-After header, just to avoid folks having to include tenacity as a dependency for common cases.