Implemented fast reconnection

[martinmitrevski]

🎯 Goal

Implement fast reconnect on iOS. Fast reconnect means you try to re-join without leaving the call. Other users will notice a brief freeze of you.

Check the spec on notion for more details.

🛠 Implementation

Mostly updated the WebRTC client.

🎨 Showcase

Add relevant screenshots and/or videos/gifs to easily see what this PR changes, if applicable.

Before	After
img	img

🧪 Manual Testing Notes

It's a bit tricky to test, and the success of fast reconnect depends on many factors.

However, what's important is - even if fast reconnect fails, there's a full reconnect as a fallback.

Testing steps:

• join a call on WiFi
• quickly switch to 5g / other Wifi
• you should reconnect to the call without leaving the call

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change follows zero ⚠️ policy (required)
• This change should receive manual QA
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (Docusaurus, tutorial, CMS)

🎁 Meme

[github-actions]

	1 Warning
⚠️	Please be sure to complete the Contributor Checklist in the Pull Request description

Generated by 🚫 Danger

[ipavlidakis]

There a few more points from the Spec that Android is handling and seems that we don't.

1. They seem to be handling differently the WS disconnection and the Internet connection dropping (reference)
2. When trying to fully reconnect they are trying for up to 30 seconds and then they fail. Shall we also do that (probably as part of another PR)?

I tried connecting to another wifi (the guest network of my main one) but didn't manage to get the onto the fast reconnect path

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
4 Code Smells

67.3% Coverage
0.0% Duplication