Visual Studio Code extension - Show dependencies when hovering over a resource

**Is your feature request related to a problem? Please describe.**
It can be hard to keep track of all of the dependencies between your resources in a Bicep file. This is a particular issue in long resource definitions, where you have lots of implicit dependencies between resources.

**Describe the solution you'd like**
When you hover over a resource's symbolic name in Visual Studio Code, it'd be helpful if the tooltip showed a list of the resource's dependencies - both implicit and explicit (`dependsOn`).

Start by locating the Visual Studio Code extension's hover handling for a resource's symbolic name. Trace how the Bicep file exposes implicit dependencies and the explicit dependsOn property, then determine how both can be represented in the tooltip. Done means hovering over a resource lists its implicit and explicit dependencies.

Written by the indexing model from the issue text.