Paste as Bicep: Allow pasting "propertyName: propertyValue" fragment as Bicep

I.e., allow pasting the following incomplete fragment from JSON (not valid by itself) into Bicep:
```json
"property1": 123,
"property2": "value"
```
=>
```bicep
property: 123
property2: "value"
```

Start by locating the repository's paste-as-Bicep handling and the tests covering JSON-to-Bicep conversion. Use the example in the issue as the acceptance case: an incomplete JSON property fragment should paste as a valid Bicep property fragment without requiring the JSON to be valid by itself.

Written by the indexing model from the issue text.