Wrap/Unwrap: Use the same GUI as in KV creation view to support multiline strings

[Himura2la]

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

I'm always frustrated when trying to send a multiline secret string to my colleague using a Wrap feature. The Wrap GUI enforces JSON markup, but does not provide JSON serializer:

Describe the solution you'd like

Since you force wrapped secrets to be JOSN, please replace the current Wrap/Unwrap view with a user-friendly view from the "Create Secret" page, where I can paste a multiline string as is and have it automatically serialized to JSON:

Describe alternatives you've considered

We have to use base64 or jq for multiline secrets on both sending and receiving sides.