Add lots of VSCode extension settings for customizing default appearance (#114)

* add lots of VSCode extension settings for customizing default appearance

- perf: package.json don't always launch VSCode extension extension on onStartupFinished, wait for specific file types to be opened
- sync-config script to auto-generate VSCode settings from new SSOT settings.ts module
- settings.ts sets default values, descriptions used in both VSCode extension and hover tooltips
- removed the pre-commit badge from README.md.
- deleted the npm-publish.yml workflow file as it is no longer needed.

* add error handling in get_defaults function to ensure graceful fallback to default settings when configuration access fails

- add missing settings for force vector visualization in package.json, including force shaft radius, arrow head radius, and arrow head length.
- update sync-config script to utilize the new SettingType for better type safety.

* document MatterViz vscode extension settings in extensions/vscode/readme.md linked from root readme.md

- remove .defaults. nesting level from all VSCode settings
- rename command and configuration keys in package.json to use snake_case for consistency.
- update sync-config script to reflect new settings structure.

* fix loading mp-1184225.extxyz

* fix settings.ts defaults for scene_props not taking effect

* fix invalid vscode onFileSystem activationEvents

Author: janosh