Automatically Generate Sendable models

[tareksabry1337]

Use case

Currently we are adopting modern concurrency within our application and we are making use of Apollo extensively, However the generated objects are not Sendable which makes it hard to adopt modern concurrency without depending heavily on @unchecked Sendable which is sub-optimal and might lead to crashes eventually if the objects are mutated across different threads

Describe the solution you'd like

Introduce a flag for the auto generation script to get rid of the setters in the generated APIs and conform to Sendable for these models

[AnthonyMDev]

Thank you for the feedback! This is already being tracked in #2835! We plan to look into this soon. As we know this is causing problems for users adopting Swift concurrency features.