[Android] Add window.open UCP delegation

[tiagocandido]

What changes are you making?

Completes the window.open UCP delegation handshake on Android, bringing it to parity with Swift PR #82. The kit advertises window.open in the ec.ready response, handles ec.window.open_request internally via an ACTION_VIEW Intent, and narrows the native link-intercept to non-http schemes. The legacy consumer-facing link-click hooks are removed in favor of fully kit-internal handling.

Before you merge

Important

• I've added tests to support my implementation
• I have read and agree with the Contribution Guidelines
• I have read and agree with the Code of Conduct
• I've updated the relevant platform README (platforms/swift/README.md and/or platforms/android/README.md)

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Releasing a new Swift version?

• I have bumped the version in platforms/swift/ShopifyCheckoutKit.podspec
• I have bumped the version in platforms/swift/Sources/ShopifyCheckoutKit/ShopifyCheckoutKit.swift
• I have updated platforms/swift/CHANGELOG.md
• I have updated the SwiftPM/CocoaPods version snippets in platforms/swift/README.md (major version only)

Releasing a new Android version?

• I have bumped the versionName in platforms/android/lib/build.gradle
• I have updated platforms/android/CHANGELOG.md
• I have updated the Gradle/Maven version snippets in platforms/android/README.md

Tip

See the Contributing documentation for the full release process per platform.

[tiagocandido]

• [Android] Add advanced present builder callbacks and migrate sample flow #112
• [Android] Add window.open UCP delegation #107 👈 (View in Graphite)
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[tiagocandido]

Open leads from Swift PR #82 mirrored here so they don't get lost during cross-platform parity work.