Sign shreds on the GPU (#6595)

* sign gpu shreds

* wip

* checks

* tests build

* test

* tests

* test

* nits

* sign cpu test

* write out the sigs in parallel

* clippy

* cpu test

* prepare secret for gpu

* woot!

* update

* bump perf libs

ledger/src/perf_libs.rs

@@ -39,6 +39,24 @@ pub struct Api<'a> {
         ) -> u32,
     >,
 
+    #[allow(clippy::type_complexity)]
+    pub ed25519_sign_many: Symbol<
+        'a,
+        unsafe extern "C" fn(
+            vecs: *mut Elems,
+            num: u32,          //number of vecs
+            message_size: u32, //size of each element inside the elems field of the vec
+            total_packets: u32,
+            total_signatures: u32,
+            message_lens: *const u32,
+            pubkey_offsets: *const u32,
+            privkey_offsets: *const u32,
+            signed_message_offsets: *const u32,
+            sgnatures_out: *mut u8, //combined length of all the items in vecs
+            use_non_default_stream: u8,
+        ) -> u32,
+    >,
+
     pub chacha_cbc_encrypt_many_sample: Symbol<
         'a,
         unsafe extern "C" fn(