Wasmer for WASM plugins

[olanod]

A more suitable WASM runtime for the server side could be Wasmer as it supports AOT compilation and comes with a smaller footprint. It might also easy the browser implementation as it provides shims for WASI or BitInt support.

[olanod]

Wasmer is still interesting to consider but as we want to give priority to running the same WASM and JS plugins in the browser that use web APIs run also in the server, we'll start with Deno as our WASM engine.