Customizing the Structure of Generated Client Code in Kiota

## Issue

Currently, Kiota generates client code based on the structure of the provided OpenAPI document. I have an API that looks like this:

```
/
└─api
└─talks
└─{id}
```

This results in the following API client code:

```csharp
var result = await kiotaClient.Api.Talks.GetAsync();
```

I find this a bit ugly. I'd prefer it to be `kiotaClient.Talks.GetAsync();` because the `Api` doesn't add anything.

Is there a way to do this? Lots of API's have `api/` in their path, so I don't think this is an exceptional case :)

My code can be found here: https://github.com/sander1095/openapi-code-generation-talk/tree/main/api-client-generation-demo