SDK: Strongly typed `fieldErrors` and `generalErrors`

[kasir-barati]

Hey fellow devs,

I was reading the doc and source code, then realized that we are not typing these two as it should be. Even though we have a much better type support in other programming languages such as Golang and php: https://github.com/FusionAuth/go-client/blob/main/pkg/fusionauth/Domain.go#L2888C2-L2888C13

So if it is not too much to ask please add a more robust typing.

Best regards
Mohammad Jawad.

[kasir-barati]

BTW I also realized in my application that I had to redefine the same class called ClientResponse because this SDK when receives a 400 error response it will throw it as an error but I do not have access to its interface