Add support for `npm-shrinkwrap` & Deno

- Deno: Parse the jsr section into a map keyed by `name@version`, link edges from `jsr[*].dependencies`, resolve `"jsr:@scope/name"` via specifiers, and build root from `workspace.dependencies`. This should be enough for most of the folks, but maybe needs more research.

- shrinkwrap: From what I understand we can reuse current npm parser (assuming we're targeting `lockfileVersion` >= 2/3)