Context: Bun is going to allow package.json with jsonc format (comments and trailing) tweet

Preparing ecosystem takes time and it will be a chicken or egg problem unless we support foundation for adoption.

This PR adds support for package.json with jsonc format using confbox utils.

Implementation notes:

• Using fallback approach to avoid any perf penalties. jsonc parser will be only used if parsing as json fails so we don't introduce perf penalties.
• json5 is not used since is not adopted in toolings at least and is way slower (20x vs 2x)
• when writing package.json, trailing and comments will be dropped