Parse with extension

Hello and thanks for the product

### Version Information
| Software | Version(s) |
| ------------------------| ---------- |
| Bogus NuGet Package | 34.0.1 |
| .NET Core? | 5.0 |
| .NET Full Framework? | N/A |
| Windows OS? | N/A |
| Linux OS? | Ubuntu 20.04.3 LTS |
| Visual Studio? | VSCode 1.63.2 |

### What locale are you using with Bogus?

fr

### What's the problem?

I created an extension method for Bogus following the example here: https://github.com/bchavez/Bogus/blob/master/Examples/ExtendingBogus/ExtensionsForAddress.cs
I'd like to parse an expression that uses this extension:

```csharp
faker.Parse("{{address.downtownTorontoPostalCode}}");
```
Is it something doable? Or is there any other solution to extend a dataset that would allow me to use the parser?

Looking at the code, it does not seem to be possible using extension methods because of this: https://github.com/bchavez/Bogus/blob/59985ee11fb2a34b89d940d5da8b34617f6f9f6f/Source/Bogus/Tokenizer.cs#L92
DeclaringType cannot be a dataset from Bogus

Start with Tokenizer.cs at line 92 and the linked ExtensionsForAddress.cs example to understand how Parse handles the requested extension expression. Trace the limitation around DeclaringType, then determine whether a supported extension approach can be defined; done means the requested Parse usage or an alternative documented approach is clearly established.

Written by the indexing model from the issue text.