WIP: #691
With 'stateless execution' (blockifier/cairo-vm & blocking client) disabled, remaining parts of Beerus are buildable already against wasm32-unknown-unknown target.
This allows exposing Ethereum methods (via Helios) and Starknet methods (via non-blocking client) directly, so JS client that consumes WASM library should be able to access them directly (e.g. to get recent & proven blocks from L2 and L1 respectively).

Detected wasm32 unfriendly crates:

• rustls + ring (reqwest (solved in helios), ureq)
• mimalloc (blockifier -> cairo-vm)