btcli wallet - Add JSON output support

[LinuxStem]

Is your feature request related to a problem? Please describe.

Hello,
It would be really helpful from an automation perspective if we could allow JSON support output when querying wallets information.

For instance: btcli w overview would be awesome to have a JSON output. This will help with automation, and monitoring.

Describe the solution you'd like

Some type of reproducible way to output wallet information in a JSON format.

Describe alternatives you've considered

Regular Expressions to parse it. Which works, but is not the easiest to explain nor maintain.

Additional context

No response