TLS: Add CurvePreferences (to enable kyber768) (#3991)

Co-authored-by: RPRX <63339210+RPRX@users.noreply.github.com>

transport/internet/tls/config.proto

@@ -84,4 +84,7 @@ message Config {
   repeated bytes pinned_peer_certificate_public_key_sha256 = 14;
 
   string master_key_log = 15;
+
+  // Lists of string as CurvePreferences values.
+  repeated string curve_preferences = 16;
 }