Generated methods return `ResponseValue<reqwest::Upgrade`, which may be
passed to a websocket protocol implementation such as
`tokio_tungstenite::WebSocketStream::from_raw_stream(rv.into_inner(), ...)`
for the purpose of implementing against the raw websocket connection, but
may later be extended as a generic to allow higher-level channel message
definitions.
Per the changelog, consumers will need to depend on reqwest 0.11.12 or
newer for HTTP Upgrade support, as well as base64 and rand if any
endpoints are websocket channels:
```
[dependencies]
reqwest = { version = "0.11.12" features = ["json", "stream"] }
base64 = "0.13"
rand = "0.8"
```
Co-authored-by: lif <>
introduce an intermediate form; this is going to be used to generate a few different things:
- an interator interface for paginated APIs; the IR will let us re-use
the typify types
- a CLI generator that will generate calls into the generated client
- an automated test harness that will validate the generated client
against a mock server