Implemented file embedding functionality in PDF output without visible annotations.
1The following code will embed attachments in the PDF.2#pdf.embed("hello.txt")34Multiple parameters can be manually configured.5#pdf.embed("changelog.typ", description: "Source code of this document.", mime-type: "text/plain", relationship: "source")67You can also insert from `bytes` with a custom filename.8#let data = read("hello.txt", encoding: none)9#pdf.embed("hello2.txt", data)