Implement user block feature

[testableapple]

🔗 Issue Links

Resolve https://github.com/GetStream/ios-issues-tracking/issues/788

🎯 Goal

Implement user blocking feature.

🧪 Manual Testing Notes

1. On first entry

• Enable blocking feature in configuration
• Open channel long-press participant's message
• Verify action item (Block user / Unblock user)

2. On reconnect

• Enable blocking feature in configuration
• Open channel
• Block user
• Log out and log in as the same user
• Open channel long-press participant's message
• Verify action item (Block user / Unblock user)

3. Get the list of blocked users

• Enable blocking feature in configuration
• Open channel
• Block user
• Open channel debug menu
• Open blocked users view
• Verify that blocked user is in the list

4. 1:1 channel

• Enable blocking feature in configuration
• Open a 1:1 channel
• Block user
• Send a message as a blocked user
• There should be no messages from the blocked user

5. Group channel

• Enable blocking feature in configuration
• Open a group channel
• Block some user
• Send a message as a blocked user
• The message should be visible to the main user

6. 1:1 channel

• Enable blocking feature in configuration
• Block user
• Send a message as a blocked user to the 1:1 channel
• Send a message as a blocked user to the group channel
• Open the group channel and read a message
• Go back to the channel list
• There should be no messages from the blocked user in 1:1 channel

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• This change follows zero ⚠️ policy (required)
• This change should be manually QAed
• 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 Error
🚫	Please use more than one word. 795c614

	2 Warnings
⚠️	Big PR
⚠️	The changes should be manually QAed before the Pull Request will be merged

Generated by 🚫 Danger

[nuno-vieira]

LGTM! ✅

[laevandus]

The icons looks with lighter color and the show blocked users debug command reported JSON parsing issue

[laevandus]

I tried QA verification steps and these worked correctly.

[sonarcloud]

Quality Gate passed

Issues
131 New issues
0 Accepted issues

Measures
0 Security Hotspots
84.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud