Hierarchical Multi-Selection Prompt

[assaftir]

Is your feature request related to a problem? Please describe.
Currently, the AddChoiceGroup method allows creating groups of choices, which is quite handy.
However, I've found that there are use cases where it would be beneficial to have hierarchical or nested groups, essentially creating a multi-level or tree-like choice structure.

Describe the solution you'd like

Describe alternatives you've considered
As of now, my workaround for this has been to create a sequence of prompts, where each prompt represents a level in the hierarchy. However, this results in multiple prompts rather than a single, unified hierarchical multi-selection prompt.

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