Research use of native Web Crypto API

[0x009922]

Currently crypto utilities in @iroha/core are relying on a WebAssembly port of iroha_crypto crate. While it works fine, it is hard to make it work in all environments uniformly (e.g. browser vs server-side).

Maybe, Web Crypto API could handle all of the cases?

API	Support
Hash	Nope. Web Crypto doesn't support Blake2b. However, hash-wasm provides a tiny 6kb wasm with its implementation.
todo	todo