WASM + WS support

This is a bit of a dream for the future, but it would be amazing if this crate can support compiling to WASM, use WS through browser apis, and then provide Promise-based APIs for JS/TS consumption.

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Resources;

https://lib.rs/crates/ws_stream_wasm

https://rustwasm.github.io/wasm-bindgen/reference/js-promises-and-rust-futures.html