Use Cbor (#572)

* Track marshal/unmarshal performance

* Use Cbor

* Refine

* Drop logging

---------

Co-authored-by: GG Bond <whatever@tagkong.com>

app/src/main/rust/Cargo.toml

@@ -15,7 +15,7 @@ tl = "0.7"
 log = "0.4"
 android_logger = { default-features = false, version = "0.13" }
 once_cell = { default-features = false, version = "1.19" }
-serde_json = "1.0"
+serde_cbor = "0.11"
 serde = { version = "1.0", features = ["derive"] }
 
 [profile.release]

app/src/main/rust/src/lib.rs

@@ -91,7 +91,7 @@ where
                     let slice = slice_from_raw_parts_mut(ptr, 0x80000);
                     Cursor::new(&mut *slice)
                 };
-                serde_json::to_writer(&mut cursor, &value).unwrap();
+                serde_cbor::to_writer(&mut cursor, &value).unwrap();
                 cursor.position() as i32
             }
         }