Add graceful check for WebAssembly

[maxammann]

🤔 Expected Behavior

When a browser does not support WebAssembly (Vanadium in default config) we should raise an error and then show an alert. All of this should be handled in JS obviously.

😯 Current Behavior

An error is thrown.

💁 Possible Solution

🔦 Context

💻 Code Sample

🌍 Your Environment

• Web
  • Browser: Vanadium
  • Version: -