feat(chat): add is_participants_hidden

[HitaloM]

Description

Adds the attribute is_participants_hidden to the Chat type. If the list of members is hidden, True will be returned; otherwise, False will be returned.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

I have tested in a private bot, using client.get_chat() method, it's seems to be working correctly.

Test Configuration

• Operating System: Arch Linux 5.15.133.1-microsoft-standard-WSL2
• Python Version: 3.12.0

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[usernein]

Nice job, thank you!