Passing configuration object to FusionAuthClient 🤔

Would be a syntactic improvement (if you ask me) if you could pass a configuration object to `FusionAuthClient` instead of directly passing the constructor values.

For readability it looks a tad nicer if you got 

```ts
const client= new FusionAuthClient(
  { 
    apiKey: "asda-sd-asd",
    host: "https://localhost",
    tennantId: "bla-bla-bla"
  }
)
```