Related to #3530
Add examples for `with_cfg`, `with_context`, and `with_context_provider` methods in the `LaunchBuilder` documentation.
* **with_context_provider**: Add an example demonstrating how to inject state into the root component's context created on the thread that the app is launched on.
* **with_context**: Add an example demonstrating how to inject state into the root component's context.
* **with_cfg**: Add an example demonstrating how to provide a platform-specific config to the builder.
Vishwanath Martur
2fd7684a93