* separating onnx parsing from burn-import
* ran clippy and cargo-fmt
* removed unused deps from onnx-ir
* fixed clippy warnings that were causing run-checks to fail
* removed dead code
* removed unused dependencies from burn-import
* updated contributor-book, updated publish.yml, added readme
* update cargo lock
* formatted md document with prettier, rephrased sentence
* missed the errors with reduce_prod_conversion during merge
* formatted onnx-to-burn-conversion-tool.md, forgot to save
王翼翔