Implement Local Filter processing for ChannelListController

[ipavlidakis]

🔗 Issue Links

Resolves https://github.com/GetStream/ios-issues-tracking/issues/261

🎯 Goal

Allow local filter processing in order to reduce the need for a local filter block in ChannelListController.

🛠 Implementation

This PR implements the following:

• Implement keyPathValueProvider for FilterKeys
• Update the ChannelList related filterKeys, that can be filtered locally, to provide a valid keyPathValueProvider
• Translation of API filters to DB filters (NSPredicates)
• ChannelDTO fetchRequest creation was updated to include the filter's predicate - if not nil
• Update tests

The logic is being described below:
FilterKeys that are compatible with local filter should provide a keyPathValueProvider. KeyPathValueProvider are closures that provide the keypath for the requested value or return nil if the value cannot be mapped.

The fetchRequest that the ChannelDTO, will include the filter's predicate if it's not nil. The fetchRequest can then be used to query the DB/

🧪 Manual Testing Notes

- Create a new Channel

1. Open 2 Simulators and login with different users
2. Create a new group with the 2 users + any other user you may need to add in order to ensure that a new group will be created
3. Send a message
4. The new channel should appear at the top of the list in both simulators

- Update an existing Channel

1. Open 2 Simulators and login with different users
2. Open an old existing channel with both our users
3. Send a message
4. The new channel should appear at the top of the list in both simulators

- Public API Changes

• StreamRuntimeCheck.isChannelLocalFilteringEnabled: Bool (default: true): When the flag is true the ChannelDTO will use the filter's predicate to create the fetchRequest.

- Docusaurus Update Preview

☑️ 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 Warning
⚠️	Big PR

Generated by 🚫 Danger

[nuno-vieira]

Overall looks good, just add some questions and suggested some improvements 👍

[polqf]

All good, just couple of comments 👏 Looking forward to getting this out!!

[nuno-vieira]

LGTM! ✅

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
6 Code Smells

93.8% Coverage
0.0% Duplication