reafactor: florencev2 batch processing

[hrnn]

The __call__ method now accepts lists of tasks, images, and prompts, allowing the model to process multiple inputs simultaneously. This change introduces a new _batch_image_call method that handles batch inference.

• Input validation to handle both single and batch inputs
• Adjusting the predict method to support batch processing
• Ensuring outputs are clean by setting skip_special_tokens=True during decoding, e.g. <pad>.