Typst generator

[evgenyigumnov]

https://crates.io/crates/typst

1. crate module "typst"
2. Implement "Typst generator" (generate function)

   pub trait TransformerTrait {
   fn parse(document: &Bytes) -> anyhow::Result<Document>;
   fn generate(document: &Document) -> anyhow::Result<Bytes>;
   }

3. Units test requered for this new feature (looks at tests in json module)

PS

you should do refactoring of pdf.rs generation function and move part of logic inside to mod typst.rs generation function