Add a Falco Bridge plugin
Add a Falco Bridge plugin, a dissector plugin that can load Falco plugins and dissect log events.
This MR has a lot of commits. While we normally prefer to squash them, I left them intact in order to keep the original work of each author and the evolution of the code intact.
This adds code which links with https://github.com/falcosecurity/libs/, which is Apache 2.0. As far as I can tell, this should be OK, but it means that license compatibility is attained via the GPLv2's "any later version" provision:
https://www.wireshark.org/lists/wireshark-dev/202203/msg00020.html
This also appears to be "good enough for Debian":
https://lists.debian.org/debian-legal/2014/08/msg00102.html
Libsinsp/libscap also have a C++ API, so this is a hybrid C/C++ plugin.