Analyzer to prevent hardcoding raw connection strings to bindings

### Description

Create an analyzer that warns users against hardcoding raw connection strings directly into the `Connection` property of bindings

Example of incorrect usage

```csharp
[Function(nameof(Do))]
public void Do([QueueTrigger("myq",
Connection = "DefaultEndpointsProtocol=https;AccountName=t;AccountKey=yadayada")] QueueMessage m)
{

}
```

The issue names no files, tests, or entry points. Start by locating existing analyzer diagnostics and tests in the repository, then use the shown QueueTrigger example as the initial case; done means the analyzer warns when a binding Connection contains a raw connection string.

Written by the indexing model from the issue text.