Replace Image Bytes to Closure

[evgenyigumnov]

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

Currently used Bytes for pictures. We need to switch to Closure

Required: shiva::core::TransformerTrait

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

Optional shiva::core::TransformerWithImageLoaderSaverTrait (If images store outside of document for example: HTML, Markdown)

pub trait TransformerWithImageLoaderSaverTrait {
    fn parse_with_loader<F>(document: &Bytes,  image_loader: F) -> anyhow::Result<Document>
        where F: Fn(&str) -> anyhow::Result<Bytes>;
    fn generate_with_saver<F>(document: &Document,  image_saver: F) -> anyhow::Result<Bytes>
        where F: Fn(&Bytes, &str) -> anyhow::Result<()>;
}