[zk-sdk-wasm-js] Create wasm wrappers for the rest of the sigma proof types

[samkim-crypto]

Summary of Changes

This is a follow-up to #128. All the encryption types that we want to export out to wasm was added in #78 and #128. What remains are sigma proof types and range proof types.

I was thinking of adding wrapper types for both sigma proof types and range proof types in this PR. It seemed like there are some non-trivial design choices for creating wrapper types for range proof, so I decided to focus on sigma proofs in this PR for now.

I apologize for committing in a lot of code, but most of the code is quite repetitive and mechanical.

• I created wrapper types for the proof data type and the proof context type.
• Added proof generation and verification functions for the proof data
• Added basic functions for serializing and deserializing for the context type

[grod220]

Great job! 🚢