[Feature]: addDnsRecord fails due to unexpected AutoSslIssuance field – support needed for custom Bunny fields

### Description Hi @ToshY, We're using the `addDnsRecord` method and recently noticed that Bunny.net has added a new field called `AutoSslIssuance`. However, the current validation in this package throws an error because the field is not expected: ``` Invalid argument: Unrecognised field [AutoSslIssuance] ``` This breaks functionality when working with Bunny's evolving API. ### Request: 1. **Allow passthrough of custom/unexpected fields** if Bunny adds new parameters in future, such as `AutoSslIssuance`. 2. Optionally: Provide a fallback or flag to disable strict validation mode so our integrations don't break unexpectedly. This flexibility will ensure developers can continue working even when Bunny updates their API schema before this SDK gets updated. Thanks for the great work on this package! ### Example _No response_