Add support for package.jsonc ?

[JasonKleban]

VSCode doesn't support .json5 natively (yet?) and json5's lack of quoted key requirement seems to be incompatible with jsonc. I'd like VSCode to support json5, but in case that doesn't get traction, I'll ask here too.

Also, .jsonc extension should be preferred over .json (as should yaml and json5). (See #3027) Or there should be a workspace-specific pnpm-specific setting to pick it?

[DrSensor]

Most of the tools that read tsconfig.json (e.g tsc, esbuild, ...) support comment and trailing comma. It's identified as JSON with comment (jsonc) If you open it with VSCode. Maybe it's good idea to borrow that 🙂