fix: remove nin and ne operator usage in the SDK and the sample app

[khushal87]

🎯 Goal

The $ nin and the $ne operators cause bad performance on the backend, and they will be deprecated (and eventually removed). We should also start removing them from the SDKs and the sample app and not advocate integrators to use it.

A few simplifications around the query users filter, and the case where the channel state members are less than 100 are also done in this PR.

Few other fixes in the PR:

• Fix the bug where you would get the authenticated user as well in the users list when you try to mention it.
• Restructure the functions to separate files.

🛠 Implementation details

🎨 UI Changes

iOS

Before	After

Android

Before	After

🧪 Testing

☑️ Checklist

• [ ] I have signed the Stream CLA (required)
• [ ] PR targets the develop branch
• [ ] Documentation is updated
• [ ] New code is tested in main example apps, including all possible scenarios
  • [ ] SampleApp iOS and Android
  • [ ] Expo iOS and Android

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
js_bundle_size	438.708984375 KB	442 KB	+3472 B	🔴

[stream-ci-bot]

:tada: This PR is included in version 5.38.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: