Add /kids endpoints

[ChipWolf]

Describe your suggestion

/youtubei/v1/kids/+ endpoints exist, some are quite useful, such as update_blacklist to add channels to child account blocklists from a parent account. I don't see the facility to call them from this library, this would be a good addition :)

I'm aware of the following endpoints from what I've found online:

- kids/clear_blacklist
- kids/get_available_kids_curators
- kids/get_kids_flow_data
- kids/get_parent_approved_content
- kids/get_selected_kids_curators
- kids/update_blacklist
- kids/update_parent_approved_content
- kids/update_selected_kids_curators

Other details

No response

Checklist

• I am running the latest version.
• I checked the documentation and found no answer.
• I have searched the existing issues and made sure this is not a duplicate.
• I have provided sufficient information.

[github-actions]

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