nodejs: add pnpm-lock.yaml translator

[tinybeachthor]

https://pnpm.io/

https://github.com/vercel/serve/blob/main/pnpm-lock.yaml

[wmertens]

sadly it will have to be an ifd translator because Nix can't parse yaml.

The discoverer will also need updating to figure out pnpm workspaces, I think?

It does have all the necessary information in the file; the npm urls have to be composed manually.

[wmertens]

Maybe this will be useful https://github.com/arcnmx/nixexprs/blob/f90f7c0a758f2142a448b9e59cc5d6f768b9275b/lib/from-yaml.nix

[tinybeachthor]

pnpm workspaces

example: https://github.com/vuejs/core

pnpm workspaces are defined a bit different than npm workspaces

The discoverer will need to be extended to handle pnpm projects.

[hsjobeki]

pnpm has that complex structure. It also is the only tool that is capable of resolving peerDependency conflicts.
Translating pnpms lockfile is not enough to support pnpm as it can produce edge cases that are not representable with the plain npm node_modules structure. It is also necessary to change the node_modules structure of the builder(s)