Timelock: Research if wasm-pack can map Rust types to TS types and preserve them

[driemworks]

• Currently, the wasm-pack output for the wasm dir contains a generated types file, but all types are any, while the are of type JsValue in Rust (from the serde_wasm_bindgen library)
• Since all types are any currently, we need to check types in the timelock.ts file. This works, but if the input parameters or return types change in the wasm lib, this could potentially be missed in the typescript
  • it could be verified only at runtime, but it would be optimal to fail at compile time if the types are wrong
• it would be ideal if the generated types in timelock_wasm_wrapper.d.ts to map the JsValue to a type (probably UInt8Array).