Introduce a new meilitool to help the cloud team

meilitool/src/uuid_codec.rs

@@ -0,0 +1,24 @@
+use std::borrow::Cow;
+use std::convert::TryInto;
+
+use meilisearch_types::heed::{BytesDecode, BytesEncode};
+use uuid::Uuid;
+
+/// A heed codec for value of struct Uuid.
+pub struct UuidCodec;
+
+impl<'a> BytesDecode<'a> for UuidCodec {
+    type DItem = Uuid;
+
+    fn bytes_decode(bytes: &'a [u8]) -> Option<Self::DItem> {
+        bytes.try_into().ok().map(Uuid::from_bytes)
+    }
+}
+
+impl BytesEncode<'_> for UuidCodec {
+    type EItem = Uuid;
+
+    fn bytes_encode(item: &Self::EItem) -> Option<Cow<[u8]>> {
+        Some(Cow::Borrowed(item.as_bytes()))
+    }
+}