Add support for TLS connections with self-signed cert on validator gRPC interface

[aschran]

Client side use of TLS will be enabled-by-default in a future PR.

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[bmwill]

Would it be possible to add a client impl so that we can test the tls part added in this pr?

[aschran]

Would it be possible to add a client impl so that we can test the tls part added in this pr?

I was hoping to keep it smaller for review purposes but we could just do it all at once if you prefer