Upon successful research and spike done in DEV-466, we proceed with this.

Envisioning a new version of the JCR node endpoint to return content in a more compact format.

For GET operations: take a query parameter named verbose, defaults to false.
If true, return same output as currently, with all JCR property metadata.
If false, return a compact form, with common representation for number/date types.

(We can omit links in a first step, but good to try it out nonetheless)