Add BlindSignAuthOptions proto to BlindSignAuth constructor. This options proto will allow callers to configure BlindSignAuth with new features.

PiperOrigin-RevId: 562945128
diff --git a/build/source_list.json b/build/source_list.json
index 3be1a6b..c3dd079 100644
--- a/build/source_list.json
+++ b/build/source_list.json
@@ -1628,6 +1628,7 @@
     "quiche/blind_sign_auth/proto/any.proto",
     "quiche/blind_sign_auth/proto/attestation.proto",
     "quiche/blind_sign_auth/proto/auth_and_sign.proto",
+    "quiche/blind_sign_auth/proto/blind_sign_auth_options.proto",
     "quiche/blind_sign_auth/proto/get_initial_data.proto",
     "quiche/blind_sign_auth/proto/key_services.proto",
     "quiche/blind_sign_auth/proto/public_metadata.proto",