fix: A liberal sprinkling of type: module

[kriskowal]

This change adds "type": "module" to various package.json files per the newish Node.js convention for declaring the intended format of .js files. Although -r esm does not appear to need this it is "proper" and will help Endo.

[katelynsills]

The change itself looks fine to me. I'd rather not merge without tests passing, and it seems be related to the bundling

[kriskowal]

Oh, my. This looks like an argument between -r esm and ESM. Investigating.

[kriskowal]

I’ve tread over a landmine. Stepping away slowly. #527 (comment)

I think I can invent a convention that will allow Endo to bridge ESM/RESM codebases, using a higher-precedence package.json configuration that only it recognizes, like {"parsers": {"js": "mjs"}} or something similar. Might even be able to hint at a future where another package can provide parsers, like {"parsers": {"html": "gutentags/html"}, "devDependencies": {"gutentags": "^2.0.0"}}.