feat: html and vue printer

Ports Prettier's language-html onto the doc printer: angular-html-parser's
lexer and tree builder, print-preprocess, and the printers of children,
elements, tags, and attributes, by way of bun's Rust port. Code in other
languages goes to an Embed hook as text.

The napi binding exposes format with the hook, and
tests/oracle/conformance.ts runs Prettier's own fixtures with Prettier
formatting the embedded code: html 205/254, vue 124/194.