[ISSUE-3972] Switch User 2

[leandroBorgesFerreira]

🎯 Goal

Add function to switch users. ChatClient.switchUser.

🛠 Implementation details

Events of disconnection are being handled synchronously instead of async. Then the connection of a new user only happens when the SDK already fully disconnected with the previous user.

🎨 UI Changes

https://user-images.githubusercontent.com/10619102/184191580-2bda483d-02d3-43be-aaa8-d68fcec431fc.mov

🧪 Testing

Switch users with or without internet.

☑️Contributor Checklist

General

• [x] I have signed the Stream CLA (required)
• [x] Assigned a person / code owner group (required)
• [x] Thread with the PR link started in a respective Slack channel (#android-chat-core or #android-chat-ui) (required)
• [x] PR targets the develop branch
• [x] PR is linked to the GitHub issue it resolves

Code & documentation

• [x] Changelog is updated with client-facing changes
• ~[ ] New code is covered by unit tests~
• [x] Comparison screenshots added for visual changes
• [x] Affected documentation updated (KDocs, docusaurus, tutorial)

☑️Reviewer Checklist

• [ ] UI Components sample runs & works
• [ ] Compose sample runs & works
• [ ] UI Changes correct (before & after images)
• [ ] Bugs validated (bugfixes)
• [ ] New feature tested and works
• [ ] Release notes and docs clearly describe changes
• [ ] All code we touched has new or updated KDocs

🎉 GIF