Add protobuf module as wasm module

[DmitryAstafyev]

Description

To avoid generating a code for both (rust and JS) sides, we can:

• generate only a rust representation of the protocol.
• create wasm module with generated code
• use wasm module on JS side to decode/encode messages

In this way we can be sure: that messages on rust and JS will be encoded/decoded in the same way

Motivation

Research shows: that using different libraries/modules to generate code based on *.proto at the end can give different results. For example same message can be encoded into different bytes on JS side and on Rust side. That makes work with protocol unpredictable.

[DmitryAstafyev]

General note: code isn't documented at all. It will be before merging.