Can't serialize value type 'UUID'

[howieweiner]

Hi. I've just started using the xero-python SDK (v 6.3.0) to retrieve Invoices. There appears to be an issue in the client when serializing UUID fields

This code:

response = accounting_api.get_invoice(XERO_TENANT_ID, invoice_id)

throws a ValueError `Can't serialize value type 'UUID' when attempting to serialize the model.

I've resolved this issue by patching the serializer based on this suggestion in Issue #93

@serialize_model.register(UUID)
def serialize_uuid_model(model):
    """Serializes api model into an json serializable object.

    :param model: BaseModel instance to serialize
    :return: serialized object
    """
    return model.hex
    ```

[github-actions[bot]]

PETOSS-653

[github-actions[bot]]

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