ORC-1724: JsonFileDump utility should print user metadata

[cxzl25]

What changes were proposed in this pull request?

This PR aims to implement JsonFileDump to output user metadata.

Why are the changes needed?

ORC-223 implements the output of user metadata in non-json format, but the json format does not output user metadata.

How was this patch tested?

add UT

Was this patch authored or co-authored using generative AI tooling?

No