Dev serialization (#64)

* Added compressed serialization for GLWECiphertext + Ciphertext decompression

* Added compressed serialization for GGLWECiphertext & GLWESwitchingkey

* generalized automorphism test

* Removed ops on scalar_znx, replaced by as_vec_znx/as_vec_znx_mut and then call op on vec_znx

* Added tests for automorphism key encryption

* Added tensorkey compressed

* added ggsw compressed

core/src/glwe/tests/generic_serialization.rs

@@ -0,0 +1,23 @@
+use backend::hal::{
+    api::VecZnxAlloc,
+    layouts::{Backend, Module},
+    tests::serialization::test_reader_writer_interface,
+};
+
+use crate::{GLWECiphertext, GLWECiphertextCompressed};
+
+pub(crate) fn test_serialization<B: Backend>(module: &Module<B>)
+where
+    Module<B>: VecZnxAlloc,
+{
+    let original: GLWECiphertext<Vec<u8>> = GLWECiphertext::alloc(module, 12, 54, 3);
+    test_reader_writer_interface(original);
+}
+
+pub(crate) fn test_serialization_compressed<B: Backend>(module: &Module<B>)
+where
+    Module<B>: VecZnxAlloc,
+{
+    let original: GLWECiphertextCompressed<Vec<u8>> = GLWECiphertextCompressed::alloc(module, 12, 54, 3);
+    test_reader_writer_interface(original);
+}