wasm support

[wjian23]

Is your feature request related to a problem? Please describe. support compile to wasm and run in web browser

Known issues and tasks

• [x] compile to wasm
• [x] run_on_demand not available in web
• [x] futures executor not compatible in wasm and future block_on not work on web
• [ ] gpu impl with not compatible features, like bind_array
• [ ] review the window event in wasm
• [ ] script to run examples in wasm