Microsoft.CodeAnalysis.BannedApiAnalyzers warn on parameter if used

**Brief description:**

I have a BannedSymbols.txt file with the following content

N:AutoMapper;Consider removing AutoMapper from your project. It will be commercial in v15

and expect that BannedApiAnalyzers will report any usage. Unfotunately it will report only when I call methods on the banned type, not the usage itself. E.g. if the banned type is used as constructor parameter or field then nothing will be reported.

**Languages applicable:**

C# (not tried in VB)

**Code example that the analyzer should report:**

```csharp
using AutoMapper;
public class Test
{
private readonly IMapper _mapper; // <-- should warn here

public Test(IMapper mapper) // <-- should warn here
{
_mapper = mapper;
}

public void T()
{
_mapper.Map(5); // here correclty warned
}
}
```

Reproduce the issue with BannedSymbols.txt and the C# example using AutoMapper.IMapper. Start by tracing BannedApiAnalyzers handling of type references, then verify that field and constructor-parameter usages produce warnings while the existing method-call warning remains. Done means the reported locations match the marked declarations.

Written by the indexing model from the issue text.