Remove dependency on js-sha256

[SilentRhetoric]

Problem

The old package js-sha256 uses require() and thus causes problems running in a browser context. See issue https://github.com/emn178/js-sha256/issues/33 on the repo suggesting that it be deprecated.

Solution

Use the Web Crypto API or an alternative package that can run in the browser for client-side applications.

Dependencies

Urgency

Using the JS Algo SDK breaks Vite builds. Example error message below:

`undefined:1 require('crypto') ^

ReferenceError: require is not defined in ES module scope, you can use import instead This file is being treated as an ES module because it has a '.js' file extension and '/Users/brianwhippo/Code/alright-solid/package.json' contains "type": "module". To treat it as a CommonJS script, rename it to use the '.cjs' file extension. at eval (eval at nodeWrap (file:///Users/name/Code/alright-solid/dist/server-0978c76d.js:30849:19), :1:1)`

[jasonpaulos]

Based on the limited amount of information here, I believe that error is more likely to be because of the tweetnacl-js library than js-sha256. If that's the case, #707 was recently merged which solves that specific issue. But if you are using this library as a dependency in a browser project, you're also likely to run into #708, which we haven't fixed yet.

[paulmillr]

https://github.com/algorand/js-algorand-sdk/issues/742