JSON output format for metadata commands

Connected with https://github.com/dbeaver/dbvr/issues/97

We want to add the JSON format for the output for our meta commands: https://dbeaver.com/docs/dbvr/meta/

Example:

```
dbvr meta table ddl -ds my-datasource-id -sn=public -tn=orders --outputFormat=json
# Ok: {"status": "ok", "table DDL": []}
# Error: {"status": "error", "code": 1, "message": "Connection failed", "details": {...}}
```

Read the meta-command documentation at https://dbeaver.com/docs/dbvr/meta/ and the connected issue https://github.com/dbeaver/dbvr/issues/97 first. Trace the output path for `dbvr meta table ddl` and determine how the requested JSON format should apply across meta commands. Done means successful and failed commands emit JSON matching the documented status, result, error code, message, and details structure.

Written by the indexing model from the issue text.