LAYOUT-1519 - Use RoktUx library in Demo app

[thomson-t]

Background

• Add the mavenLocal for locally published libraries
• Use the roktux and networkhelper libraries
• Show a dialog after the QR code is scanned, to choose which should be used for rendering
• When legacy sdk is selected, follow the old flow, call init and trigger execute
• When UxHelper is selected use networkhelper to fetch the demo response as a string and feed it to RoktLayout composable to render

Fixes [(issue)]

What Has Changed:

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How Has This Been Tested?

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Notes

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Checklist:

• I have performed a self-review of my own code.
• I have made corresponding changes to the documentation.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have verified that CI completes successfully.
• All insignificant commits have been squashed.