Docx parser

[evgenyigumnov]

1. Implement "docx parser" (parse function)

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

2. Units test requered for this new feature

recommended crates:

zip = "0.6"
quick_xml = "0.31.0"

Docx format is a zip file with this file structure

all content concentrated in document.xml file

exmaple docx file: shiva\lib\test\data\document.docx