feat: add missing into/from_raw_parts functions for compressed KSK material

tfhe/src/integer/key_switching_key/mod.rs

@@ -223,6 +223,19 @@ impl CompressedKeySwitchingKeyMaterial {
             material: self.material.decompress(),
         }
     }
+
+    pub fn from_raw_parts(
+        material: crate::shortint::key_switching_key::CompressedKeySwitchingKeyMaterial,
+    ) -> Self {
+        Self { material }
+    }
+
+    pub fn into_raw_parts(
+        self,
+    ) -> crate::shortint::key_switching_key::CompressedKeySwitchingKeyMaterial {
+        let Self { material } = self;
+        material
+    }
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, Versionize)]

tfhe/src/shortint/key_switching_key/mod.rs

@@ -843,6 +843,28 @@ impl CompressedKeySwitchingKeyMaterial {
             destination_key: self.destination_key,
         }
     }
+
+    pub fn from_raw_parts(
+        key_switching_key: SeededLweKeyswitchKeyOwned<u64>,
+        cast_rshift: i8,
+        destination_key: EncryptionKeyChoice,
+    ) -> Self {
+        Self {
+            key_switching_key,
+            cast_rshift,
+            destination_key,
+        }
+    }
+
+    pub fn into_raw_parts(self) -> (SeededLweKeyswitchKeyOwned<u64>, i8, EncryptionKeyChoice) {
+        let Self {
+            key_switching_key,
+            cast_rshift,
+            destination_key,
+        } = self;
+
+        (key_switching_key, cast_rshift, destination_key)
+    }
 }
 
 // This is used to have the ability to build a keyswitching key without owning the ServerKey