Closing ipython session without closing conn causes BufferManagerException

[raulcf]

How to reproduce:

1. open an iPython session.
2. create a (kuzu) connection to a dataset
3. close ipython (exit()) without closing the kuzu connection

Outcome:

"libc++abi: terminating with uncaught exception of type kuzu::common::BufferManagerException: Buffer manager exception: Deleting buffer that is still pinned. pinCount: 1 pageIdx: 12" -> the python process is killed

Environment:

python (3.7) running on a virtualenv on macosx

What I'd expect instead:

when ipython sends the kill signal to the C++ process, the buffer is unpinned

[mewim]

Fixed in #1124