feat: configure extension that handlers document preview

[Myriad-Dreamin]

This PR adds a tinymist.previewExtension configuration item to get a different frontend implementation from the extension.

tinymist.previewExtension is the name of a VS Code extension to customize preview, like hardware-accelerated rendering or previewing with a different theme. If not set, the extension will use the embedded preview feature. The default value is myriad-dreamin.tinymist (the main tinymist extension).

With this configuration, we can bravely add some break change or experimental features in the different frontend implementation. For example:

• Use vello (webgpu backend) to render typst documents.
• Use slint (native backend like Wayland) to render documents.
• Add option to set invert filter value (e.g. for fully black dark theme) #746
• feat: render typst document in web worker #1903

[gemini-code-assist]

Summary of Changes

Hello @Myriad-Dreamin, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the flexibility of the Tinymist VS Code extension's preview capabilities by introducing a new configuration option. Users can now specify an external extension to handle preview rendering, decoupling the core extension from specific preview implementations. This change paves the way for integrating more experimental or specialized preview features, such as WebGL-based rendering or custom thematic presentations, without requiring modifications to the main extension, thereby promoting modularity and innovation.

Highlights

• New Configuration Item: Introduced a new configuration item, tinymist.previewExtension, allowing users to specify an external VS Code extension for preview customization.
• External Preview Flexibility: This new setting enables the use of different frontend implementations for the preview feature, supporting advanced capabilities like hardware-accelerated rendering or custom themes.
• Default Behavior: If tinymist.previewExtension is not explicitly set, the extension will default to using its embedded preview functionality. The default value for this configuration is myriad-dreamin.tinymist.

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[gemini-code-assist]

Code Review

This pull request introduces a new configuration setting, tinymist.previewExtension, which is intended to allow users to specify an external VS Code extension for the document preview. The changes include adding the configuration to package.json and providing English and Chinese localization for its title and description.

While the configuration is correctly defined, the implementation to use this setting within the VS Code extension appears to be missing. For the feature to be complete, the extension code needs to read this configuration and load the specified preview extension. I've added a specific comment regarding this.

[gemini-code-assist]

This change adds the tinymist.previewExtension configuration, but the logic to use this setting seems to be missing in the extension's code. For this feature to work, the extension needs to read this configuration value and, if an external extension is specified, activate or interact with it for the preview functionality. For example, in editors/vscode/src/extension.ts, the previewActivateInTinymist function would need to be updated to handle this new configuration.