VS Code - add publish to registry command

To improve experience when publishing modules to Bicep registry, we should be able to right-click and/or have an option in command palette to publish module(s) to registry.

UX - need to think through user experience.

Start by reviewing the existing VS Code commands and the module publishing flow for the Bicep registry. Determine whether publishing should be exposed through a right-click action, the command palette, or both, and define the UX and completion criteria before implementation.

Written by the indexing model from the issue text.