refactor: integrate WireAuthentication into existing login flow - WPB-14545

[johnxnguyen]

WPB-14545 Spike Clone - [iOS] Implement Enterprise SSO Login UX Flow

Issue

The existing authentication flow controlled by the AuthenticationController extends past the new flow inside WireAuthentication. For this reason we need to be about to insert the new flow into the old one so that when the new flow ends it connects and continues into the legacy code.

This PR integrates the new WireAuthentication module into the existing authentication flow. It's not entirely complete, but will provide a foundation when the new flow is ready to be fully integrated.

Changes include:

• Add a new developer flag to enable the new flow
• Create a WireAuthentcationBridge that will facilitate bidirectional communication in and out of the WireAuthentication module
• Build and display the root view of the new flow
• Handle the new flow's completion

Testing

Enabled the developer flag and begin the authentication flow. This will only load and display the module.

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Checklist

• Title contains a reference JIRA issue number like [WPB-XXX].
• Description is filled and free of optional paragraphs.
• Adds/updates automated tests.

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UI accessibility checklist

If your PR includes UI changes, please utilize this checklist:

• Make sure you use the API for UI elements that support large fonts.
• All colors are taken from WireDesign.ColorTheme or constructed using WireDesign.BaseColorPalette.
• New UI elements have Accessibility strings for VoiceOver.

[netbe]

I like the naming, WireAuthenticationBridge. Left small comments nothing blocker

[github-actions]

Test Results

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Results for commit 39d2515.

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[samwyndham]

Very cool!