Extract Local should infer from object initializer properties

**Version Used**:  15.3

```CSharp
var x = new { y = DateTime.Now.ToString() };
```

**Expected**:
```C#
string y = DateTime.Now.ToString();
var x = new { y };
```

**Actual**:
```C#
string v = DateTime.Now.ToString();
var x = new { y = v };
```