Support Deno

- Deno does not have a `package.json`. It has an optional `deno.json`.
- Deno does not create a `node_modules` directory alongside each project. It downloads modules into `~/.cache/deno/deps`.
- Deno CAN use packages from npm, [jsr](https://jsr.io/), and [https](https://docs.deno.com/runtime/fundamentals/modules/#https-imports). It can use multiple sources within the same project.

Need to explore other ways package maintainers can add funding metadata to their packages. Maybe https imports will never work, but it should be possible to make it work with both npm and jsr packages on Deno.