guix: node-build-system: Add JSON utilities.

This commit adds several utility functions for non-destructive
transformation of the JSON representation used by (guix build json),
particularly for purely functional update of JSON objects.  They ought
to eventually be exported from their own module, but for now are kept
private to allow experimentation.

* guix/build/node-build-system.scm (assoc-ref*, jsobject-ref, alist-pop)
(alist-update, jsobject-update*, jsobject-union): New variables.
(with-atomic-json-file-replacement): New public variable.
(module-name, build, patch-dependencies): Use them.  Do not resort to
unsafe alist primitives from Guile core.

Co-authored-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

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