feat: Migrate to memsec

fuzz/fuzz_targets/vec_secret_alloc.rs

@@ -0,0 +1,9 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use rosenpass_secret_memory::alloc::secret_vec;
+
+fuzz_target!(|data: &[u8]| {
+    let mut vec = secret_vec();
+    vec.extend_from_slice(data);
+});