Handle SIGINT in the python catalog SDK

[abey79]

The python interpreter handles SIGINT regularly between instruction. However, it doesn't do it durring FFI calls. So when we wait_for_future for a long time (e.g because the server is slow or stalling), ctrl-C doesn't interrupt the waiting.

It would appear that the solution to that is to use [PyErr_CheckSignals](https://docs.python.org/3/c-api/exceptions.html#c.PyErr_CheckSignals). We could poll it in parallel to f in the implementation of wait_for_future, and early out with an Interrupted error. Maybe?

Background:

• https://stackoverflow.com/questions/62364030/keyboard-interrupt-from-python-does-not-abort-rust-function-pyo3/62380114#62380114

[timsaucer]

We had a related issue in datafusion-python apache/datafusion-python#1141

The relevant changes are mostly in src/utils.rs