feat: rust pnpm lockfile implementation

cli/internal/ffi/ffi.go

@@ -216,6 +216,8 @@ func toPackageManager(packageManager string) ffi_proto.PackageManager {
 		return ffi_proto.PackageManager_NPM
 	case "berry":
 		return ffi_proto.PackageManager_BERRY
+	case "pnpm":
+		return ffi_proto.PackageManager_PNPM
 	default:
 		panic(fmt.Sprintf("Invalid package manager string: %s", packageManager))
 	}

cli/internal/lockfile/lockfile.go

@@ -79,6 +79,9 @@ func AllTransitiveClosures(
 	if lf, ok := lockFile.(*BerryLockfile); ok {
 		return rustTransitiveDeps(lf.contents, "berry", workspaces, lf.resolutions)
 	}
+	if lf, ok := lockFile.(*PnpmLockfile); ok {
+		return rustTransitiveDeps(lf.contents, "pnpm", workspaces, nil)
+	}
 
 	g := new(errgroup.Group)
 	c := make(chan closureMsg, len(workspaces))