(Windows) New table: connectivity

[woodruffw]

Introduces the connectivity table, which contains the current system-wide (i.e., all interface) network state:

osquery> select * from connectivity;
+--------------+-----------------+-----------------+-------------+--------------------+---------------+-------------+--------------------+---------------+
| disconnected | ipv4_no_traffic | ipv6_no_traffic | ipv4_subnet | ipv4_local_network | ipv4_internet | ipv6_subnet | ipv6_local_network | ipv6_internet |
+--------------+-----------------+-----------------+-------------+--------------------+---------------+-------------+--------------------+---------------+
| 0            | 0               | 1               | 0           | 0                  | 1             | 0           | 0                  | 0             |
+--------------+-----------------+-----------------+-------------+--------------------+---------------+-------------+--------------------+---------------+

Each column corresponds to an NLM_CONNECTIVITY flag: https://docs.microsoft.com/en-us/windows/desktop/api/netlistmgr/ne-netlistmgr-nlm_connectivity

[woodruffw]

CI failure looks like an unrelated hang.

Anything else I can do here?

[woodruffw]

cc @theopolis or @alessandrogario for a review here -- should be good to go, apart from the unrelated macOS CI failures.

[theopolis]

Will do shortly, and heads up, the macOS failures should be fixed on master.

[theopolis]

We've addressed the CI failure. If you don't mind rebasing onto master, this should fix the issue.