TypeScript support

we should support TypeScript

We can iterate on this and go like this

• add a new language "TypeScript" without compilation
• Add support for compilation
• Add instructions on how to enable TypeScript support in Extensions.js - TypeScript should not run if it's not enabled
• add support for type checks with Biome LSP use typescript-language-server
• port Welcome demo to TypeScript
• Add TypeScript support to workbench-cli
• have the build-aux/library.js compile TypeScript main.ts files to equivalent main.js files (and run biome formatter over them)
• port more demos to TypeScript https://github.com/workbenchdev/demos/pull/201
• replace BrainBlasted/gi-typescript-definitions with generating types at build time
  • Add a simple script that will generate the types for us. Probably similar to https://github.com/vixalien/gi-typescript-definitions/blob/main/generate_types_in_flatpak.sh https://github.com/workbenchdev/demos/pull/201
  • https://floss.social/@jumplink/114218446354825670

Start with build-aux/library.js and the remaining TypeScript checklist items in this issue. Review the linked demos pull request and the referenced type-generation script for context. Done means compiling main.ts files to equivalent main.js files, running the formatter, porting more demos, and adding build-time type generation.