[JS] onnxruntime-web (#7394)
* add web
* add script and test
* fix lint
* add test/data/ops
* add test/data/node/ to gitignore
* modify scripts
* add onnxjs
* fix tests
* fix test-runner
* fix sourcemap
* fix onnxjs profiling
* update test list
* update README
* resolve comments
* set wasm as default backend
* rename package
* update copyright header
* do not use class "Buffer" in browser context
* revise readme
