See https://github.com/emn178/js-sha256/issues/18

The old version is no longer maintained and doesn't support rollup v3

This has proper support for rollup while providing the same API.

This is what open-wc recommends now and uses in their @open-wc/testing package

Takes a package name and a dest path. This way we can more eassily change the
layout and it will error out on package name typos or missing packages.

Add a scope so we don't have to care about naming conflicts
and set the verison to 0.1.0 since we don't have a stable API yet.

Use tdd in all cases to be more consisstend.
Also since last year we can use chai with rollup directly, so
do that everywhere instead of relying on karma-chai injecting
it in to the global scope.

We no longer bundle keycloak-js with rollup so we can remove those
special cases.

Instead of hardcoding the paths of the node_modules directory we use the node-resolve
plugin of rollup to find the root of the corresponding JS package and calcucate a path from
there.

Resolving a package requires calling an async function, so we have to use await in the rollup config.
Luckily rollup supports configs wrapped in a promise, so we just have to wrap it in a function which returns
a promise.

This way we don't have to mirror the directory structure in packages
which vendor this package.

rollup builds the demo, everything else just gets the web component