DNS-CLI: structured output for the zone-records command

**Is your feature request related to a problem? Please describe.**
The table format is the only format `zone-records` command shows zone dns records right now. It would be nice to have an option to output dnsrecords in some structured format like yaml/json/dig so the dns records in the zone could then be piped further, to other cli tools, to work with shown zone records.

**Describe the solution you'd like**
Any structured format for dns records shown - yaml/json/dig. Can be an optional flag like `-o/--output yaml`

# actions
- [x] #657
- [ ] https://github.com/Kuadrant/dns-operator/issues/601
- [x] #658

Start at the CLI implementation of the zone-records command and review the remaining work tracked in issue #601. Trace how zone DNS records are currently rendered as a table, then determine the existing output conventions before adding an optional structured format; done means the command supports the selected format and preserves the current table output.

Written by the indexing model from the issue text.