[FEATURE] enable terrain mode in storymap editor for each chapter

[JinIgarashi]

Feature Description

We need to have a feature to enable terrain mode for chapter

Feature Implementation

to do this, we need another column to store the state of terrain mode.

Feature Alternatives

No response

Feature Impact

No response

Feature Rationale

No response

Feature Considerations

No response

Feature Requirements

No response

[JinIgarashi]

I am thinking this can be implemented by adding new query param at style endpoint to enable terrain in serverside other than adding new database field.