Add coordinator v2 adapters bridging to stream-android-core

[aleksandar-apostolov]

Goal

Closes AND-1281

First step of the coordinator socket migration to stream-android-core's StreamClient. This PR only adds the bridging code — the actual swap happens in follow-up PRs. Nothing changes at runtime after this merges; the adapters aren't wired in yet.

Merge order: this PR → wire StreamClient into StreamVideoClient (#1738) → rewrite ConnectionState (#1739).

Implementation

Four new internal adapter classes under stream-video-android-core/socket/coordinator/v2/:

File	Purpose
VideoEventSerialization.kt	Reuses our existing MoshiVideoParser to plug video events into core's event pipeline
IntegrationStreamTokenProvider.kt	Wraps the integration's TokenProvider so core can consume it
GuestStreamTokenProvider.kt	Handles guest-user auth by calling the existing createGuest REST endpoint on first token load
ConnectionStateMapper.kt	Placeholder — the final StreamConnectionState → ConnectionState mapping lands in a follow-up PR

All four classes are internal. No public API changes.

Also includes four unit tests for the adapters. They fail until the wiring PR lands — that's intentional, they pin the expected behavior contracts.

Guest auth simplification: the existing WritableUserRepository interface is defined inline in GuestStreamTokenProvider for now. A follow-up PR swaps it for the concrete UserRepository once that becomes available on develop-v2.

Testing

• Full project compiles cleanly.
• stream-video-android-core:testDebugUnitTest passes.
• BCV apiCheck shows zero public API diff — the new classes are all internal.
• spotlessCheck green.

[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled, or the PR is bot-authored.
• An issue is linked (Linear ticket or GitHub issue), or the PR is bot-authored.

🎉 Great job! This PR is ready for review.

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-video-android-core	12.05 MB	12.35 MB	0.30 MB	🟡
stream-video-android-ui-xml	5.68 MB	5.73 MB	0.05 MB	🟢
stream-video-android-ui-compose	6.28 MB	5.86 MB	-0.43 MB	🚀

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 40767b9c-09ee-45d4-9c82-a8aede740c71

📥 Commits

Reviewing files that changed from the base of the PR and between a1c66bd and 625bc87.

📒 Files selected for processing (8)

• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/ConnectionStateMapper.kt
• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/GuestStreamTokenProvider.kt
• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/IntegrationStreamTokenProvider.kt
• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/VideoEventSerialization.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/ClientStateConnectionMappingTest.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/socket/coordinator/v2/GuestStreamTokenProviderTest.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/socket/coordinator/v2/IntegrationStreamTokenProviderTest.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/socket/coordinator/v2/VideoEventSerializationTest.kt

👮 Files not reviewed due to content moderation or server errors (8)

• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/VideoEventSerialization.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/socket/coordinator/v2/GuestStreamTokenProviderTest.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/socket/coordinator/v2/IntegrationStreamTokenProviderTest.kt
• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/ConnectionStateMapper.kt
• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/GuestStreamTokenProvider.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/ClientStateConnectionMappingTest.kt
• stream-video-android-core/src/main/kotlin/io/getstream/video/android/core/socket/coordinator/v2/IntegrationStreamTokenProvider.kt
• stream-video-android-core/src/test/kotlin/io/getstream/video/android/core/socket/coordinator/v2/VideoEventSerializationTest.kt

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Warning

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch gsd/phase-2-01-adapters

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