fix: allow disabling pan/zoom by fixing the camera

[flekschas]

This PR adds support for disabling pan/zoom via scatter.camera(is_fixed=True)

Description

What was changed in this pull request?

You can control the camera's fixed state via

• Scatter(camera_is_fixed=True)
• scatter.camera(is_fixed=True)

Note that when the camera is fixed, manual pan and zoom is disabled. However, you can still pan and zoom programmatically via scatter.zoom()

Why is it necessary?

Fixes #176

Demo

Screen.Recording.2024-12-11.at.10.34.08.AM.mp4

Checklist

• Provided a concise title as a semantic commit message (e.g. "fix: correctly handle undefined properties")
• CHANGELOG.md updated
• Tests added or updated
• Documentation in API.md/README.md added or updated
• Example(s) added or updated
• Screenshot, gif, or video attached for visual changes

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