GRPC Output: Also support unix domain sockets

[mstemm]

What would you like to be added:
When we add GRPC Support to falco, it would be good to have an option to support connecting to the grpc server via a unix domain socket in addition to a tcp connection.

Why is this needed:
This allows for more security for use cases where clients can be colocated with falco and allows for a slightly smoother process when developing with falco, where you might not want to generate tls certificates.

[krisnova]

The more I think about this, the more I REALLY agree with using Unix domain sockets in favor of mutually encrypted TLS for any inter process communication.

As a community driven project I think we obviously should support both, but this is just a good idea.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[fntlnz]

Wait wait wait stalebot!

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[leodido]

Keep this open /cc @kris-nova L.

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