Improve Typescript Types

[MollardMichael]

Hello, you;ve recently added typescript support which is nice but the return type of most function is type as Record<string, unknown> | undefined

This gives almost no information to the user of the SDK.

A better approach would be to type the return of each function explicitly.

validateEmail(
    email: string,
    options?: ValidateEmailOptions | string | null
  ): Promise<EmailValidationResponse>;

type EmailValidationResponse = {
    ok: false;
    error: string;
} | {
   ok: true;
   response: {
     status: ValidationStatus
    sub_status: ValidationSubStatus
    ....
  }
}

this would help user to use the SDK without having to refer to the documentation to know which fields are available.

It would be appreciated, thanks