Intellisense on typed variables

**Bicep version**
Bicep CLI version 0.34.44 (1f661a23c4)

**Describe the bug**
Typed variables don't have intellisense while untyped variables do.

**To Reproduce**
test1 gives me no suggestions on which keys are available while test2 does. Shouldn't both suggest the available keys in this hashtable as both are static / compile-time variables?

```bicep
var test1 {*: string} = {
name: 'name'
id: 'id'
}

var test2 ={
name: 'name'
id: 'id'
}

var temp1 = test1
var temp2 = test2
```

No source file or test is named. Start by reproducing the supplied Bicep snippet in the IntelliSense experience and compare suggestions for test1 and test2; done means typed and untyped variables both suggest the available hashtable keys.

Written by the indexing model from the issue text.