Panel - Add a 'required all fields' validation mode

[JaneSjs]

In the panel.isRequired mode, required validation is passed if any field is filled.

Suggestion: add a required validation mode which would require all fields within a panel to be filled.

[ashish-khankari]

Hey, could you please assign me this assignment, I would love to work

[JaneSjs]

Hi @ashish-khankari,
Thank you for your interest in contributing to our project. We truly appreciate your cooperation and look forward to working with you. As SurveyJS is an open source project, we welcome all contributors to fork the repository and submit pull requests.

Rest assured that we will carefully review your contributions.

Thank you,
Jane

[JaneSjs]

This mode will also be helpful to handle the following issue: https://surveyjs.answerdesk.io/internal/ticket/details/T13107