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

PiperOrigin-RevId: 562945128

build/source_list.bzl

diff --git a/build/source_list.bzl b/build/source_list.bzl
index 10d593d..16ab6f1 100644
--- a/build/source_list.bzl
+++ b/build/source_list.bzl
@@ -1624,6 +1624,7 @@
     "blind_sign_auth/proto/any.proto",
     "blind_sign_auth/proto/attestation.proto",
     "blind_sign_auth/proto/auth_and_sign.proto",
+    "blind_sign_auth/proto/blind_sign_auth_options.proto",
     "blind_sign_auth/proto/get_initial_data.proto",
     "blind_sign_auth/proto/key_services.proto",
     "blind_sign_auth/proto/public_metadata.proto",