domain specific TLS Configuration

We use Envoy at Edge and we have need to configure domain specific TLS configuration such as Cipher Suites, TLS versions etc. As Envoy is used as Edge proxy and we can have huge number of domains so listing all domains and configure TLS properties using CommonTLSContext is not an option.

One option, I was thinking is to extend the on-demand cert selector and expand SDS for Per-Domain TLS Properties and when SDS delivers with certs + TLS properties, we can build new context also set cipher suites etc along with certs.

@kyessenov As discussed offline, created this issue. Can you please review and suggest any alternatives?