add vscodeLanguageIds for vscode consumers, this includes coc-prettier

[ryeballar]

coc-prettier relies on vscodeLanguageIds to identify a prettier plugin to perform automatic file format on specific triggers (e.g. format on file save). Source: https://github.com/neoclide/coc-prettier/blob/master/src/utils.ts#L68.

This property is also used across multiple official prettier plugins:

• html / vue https://github.com/prettier/prettier/blob/master/src/language-html/index.js#L7
• css https://github.com/prettier/prettier/blob/master/src/language-css/index.js#L7
• js https://github.com/prettier/prettier/blob/master/src/language-js/index.js#L8

This property is also used in vscode-prettier: https://github.com/prettier/prettier-vscode/blob/main/src/LanguageResolver.ts#L37 .

[ehrencrona]

Makes sense!