Change api to work with multiple imgaes, restructure reposetory

[lexeyOK]

• update cli to look similar to cli provided by https://github.com/GoogleChromeLabs/squoosh
  in multi file mode we sould be able to change from supported image formtats to qoi with maybe --qoi flag
  or just use the same logic we have now

qoiconv-rs image1.png image2.png image3.png -d directory_to_processed_files
qoiconv-rs <...files> --output-dir <path> --suffix <suffix> --jobs 4 # not sure about suffix one
# or 
qoiconv-rs <file> --output <path>

-o will not work in multi file mode
this should be working in parallel using rayon libary in multi file mode (allow to set number of jobs with -j )
also we want some progress bar so will need to probably add console crate

• add tests for cli
• revue how cli handles files from different folders
  • should we create output file just by changing Path of input file
  • or should we put output file in the place of execution?
• remove lib to separate crate or workspace ( monorepo vs separate repos ) alternatively change binary to be associated binary