Add support for BulkDeleteMixin

[SchrodingersGat]

https://github.com/inventree/InvenTree/blob/703731ec4d60f39864379ff89c0c90e23d9cb837/InvenTree/InvenTree/api.py#L59

Some models support bulk deletion, which provides two main advantages:

• Atomicity of bulk delete
• O(1) rather than O(n)

We should add a mixin class for the python bindings:

• Only for models which support this on the backend
• Throw error if server API version is too old