Add `jsonDecodingStrategy` support to `SmartUnwrap` requests.

[amyoulton]

In Netable's current setup, you cannot provide a custom jsonKeyDecodingStrategy within a request when you are also using SmartUnwrap. It throws this error (example from trying to decode User):
Decoding Error: Resource Extraction Error: The raw result could not be turned into the final resource: Failed to unwrap type User from SmartUnwrap response. Couldn't decode object for key user.
`

The reason is that we literally didn't add the check within the SmartUnwrap request:

We need to add support to allow this!