Expose showTitle and trailingBuilder of StreamVoiceRecordingAttachment for better customisability

[khensunny]

Please select which package this feature is related to

stream_chat_flutter

Which platforms would this feature impact?

iOS, Android

Is your feature request related to a problem?

The default voice recording message widget currently displays technical details that aren't user-friendly for typical voice note interactions. Specifically:

• The cryptic filename is shown by default (e.g., "audio_175....")
• The generic file type icon doesn't provide a good user experience

Describe the solution that you'd like

Expose additional customization properties(via StreamVoiceRecordingAttachmentPlaylist) to allow developers to:

• Hide or customize the filename display
• Customize the icon widget currently used by the filetype icon

Describe alternatives that you have considered

Current Workaround:
I was able to achieve the desired appearance (shown below) by forking the default implementation. However, this required copying substantial amounts of code when I only needed to modify these two visual properties.

Additional context

No response

Code of Conduct

• I agree to follow this project's Code of Conduct