Add "type": "module" to packages

[pskelin]

webcomponents are shipped as ES6 modules, so we should add the "type": "module" field to package.json to make it more explicit and enable node.js to precess the imports as ESM.

more information:
https://nodejs.org/api/packages.html

There are a few things to be addressed that are written as common js and fail when setting the type to module:

• all configuration files list package-scripts.js will need to become either .cjs and the tooling should find them or they should become ESM too (if the tooling supports this)
• test specs are CJS right now, shoul become .cjs or be rewritten to ESM
• further adaptations to the tools package necessary to make all current scripts run