Update code samples to use initialize API

[praveek]

Is there an existing issue for this?

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What's missing?

Our documentation includes examples for setting up the SDK using the registerExtensions() API. Please update it to also include code samples demonstrating the use of the initialize() API.

For ex)
https://developer.adobe.com/client-sdks/edge/consent-for-edge-network/#register-edge-extensions-with-mobile-core