capture and handle logging messages from Binary Ninja backend

as first described and triaged in the thread here: https://github.com/mandiant/capa/pull/1343#issuecomment-1481709911
Binary Ninja emits logging messages to stdout/stderr directly, which doesn't give Python a chance to handle/format/suppress messages. When they add support for registering a logging listener, we should use it to improve the user and tester experience of capa.

Start with the linked pull request comment and locate the Binary Ninja backend and its existing logging and test entry points. When Binary Ninja supports registering a logging listener, capture its messages through Python so capa can format or suppress them, then verify the improved user and tester experience.

Written by the indexing model from the issue text.