Track concurrent Call.join attempts in join analytics

[rahul-lohra]

Goal

Track whether each Call.join() invocation starts a new join or joins an existing in-flight attempt.

Implementation

Added active-flight detection and JoinAttempt models to distinguish between single and concurrent join attempts.

1. A single attempt creates the initial join attempt ID.
2. Concurrent attempts create their own ID and reference the initial attempt using: joinReason = "from_<initialAttemptId>"

🎨 UI Changes

None

Testing

Smoke test analytics

[github-actions]

PR checklist ❌

The following issues were detected:

• Linked issue missing. Add a Linear ticket reference (e.g. AND-123, Closes AND-123, or a https://linear.app/... link) or a GitHub issue (Closes #123) to the PR description.

What we check

1. Title is concise (5–18 words) unless labeled pr:ignore-for-release.
2. At least one pr: label exists (e.g., pr:bug, pr:new-feature).
3. Sections ### Goal, ### Implementation, and ### Testing contain content. Bot-authored PRs are exempt.
4. PR description references an issue (Linear ticket like AND-123, a Linear URL, or a GitHub Closes #N). Bot-authored PRs are exempt.

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-video-android-core	12.29 MB	12.30 MB	0.02 MB	🟢
stream-video-android-ui-xml	5.70 MB	5.70 MB	0.00 MB	🟢
stream-video-android-ui-compose	6.20 MB	6.20 MB	0.00 MB	🟢