Show metadata from template specs in intellisense

[jari-kuipers]

Is your feature request related to a problem? Please describe.
I'd like to see a bicep's metadata description when I reference it through Template Specs.
This does work when a module references a local bicep file.

Describe the solution you'd like
I'd like to see the metadata in intellisense when using template specs as well.

Example
The description from
metadata description = 'Module for infrastructure setup'
shows up when referencing a local bicep file but not the template spec.