feat: implement Encoder for pgwire CopyEncoder, pgwire 0.38 (#286)

* feat: add encoder impl for CopyEncoder

* feat: add take_row method to Encoder trait

* chore: update pgwire

* chore: update pgwire to 0.38

Author: sunng87

Cargo.lock

@@ -19,7 +19,7 @@ bytes = "1.11.1"
 chrono = { version = "0.4", features = ["std"] }
 datafusion = { version = "52", default-features = false }
 futures = "0.3"
-pgwire = { version = "0.37.3", default-features = false }
+pgwire = { version = "0.38", default-features = false }
 postgres-types = "0.2"
 rust_decimal = { version = "1.40", features = ["db-postgres"] }
 tokio = { version = "1", default-features = false }