provideOkHttpClient

Provides a configured OkHttpClient instance for use by the Gini API libraries.

The SDK will use this client as a base and add its own required configuration on top using OkHttpClient.newBuilder. This ensures both your custom configuration and the SDK's requirements are satisfied.

This method may be called multiple times, so implementations should either:

• Return the same cached instance (recommended for most use cases)

• Create a new instance each time (only if you have specific requirements)