Multi-select: Implement expandable and collapsible options groups, and searchable nested options

[VishnuDeepak11]

Detailed description of what you want to happen

Implement expandable and collapsible option groups, and searchable nested options. At the moment, only group parent is searchable

Upload a screenshot or reference an example if possible

Why do you need this feature?

This feature is required when there are multiple users within a group and user has to scroll all the way down to iterate to next group

Do you have a deadline?

Would be required by mid of next month

Additional information

No response