YAML/JSON Export, View, and Edit Support for Network Intents

NetBrain currently does not provide a way to export, view, or edit a Network Intent in a YAML or JSON representation; Intent configuration can only be managed through the standard interface. This enhancement proposes adding the ability to export an Intent to YAML/JSON, view its structure in that format, and edit it directly, including copying and pasting sections between different Intents. This would make Intent documentation easier for both users and AI-assisted tools, and would allow customers to reuse configuration blocks across Intents more efficiently.