Create lib test harnesses with a variety of bundlers

[jmrossy]

Problem

Many problems with the SDK and other hyp libraries don't get discovered until the libraries are published and used in an app, such as the Next.JS-based explorer or warp UI. For example, the use of node-specific code that breaks the lib's isomorphism.

Solution

Create a set of minimal test apps with a variety of bundlers (Vite, Webpack, Rollup) which package and exercise the lib before they get published to NPM