JSON output format for metadata commands

[LonwoLonwo]

Connected with #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": {...}}