draft: Wasm Intial Base

Ubaid Shaikhrequested to merge
ubaidsk/lfortran:wasm-latest into master

An attempt towards #583

Since it seems wasmblr is more for generating hard-coded WASM, I currently used Binaryen to convert the ASR to WAT (WebAssembly Text Format). It seems Binaryen does not support emitting WASM directly. I already requested for more details here.

This PR contains unnecessary code/commits. It is made to report my current progress and to seek feedback.

Edited by Ubaid Shaikh

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