Add the rust_serde to the rinf config command output

[H2Sxxa]

Changes

Add the rust_serde to the rinf config command output.

The rust_serde is really awesome, but I didn't even notice it before😭.

Before Committing

dart analyze flutter_ffi_plugin --fatal-infos
dart format .
cargo fmt
cargo clippy --fix --allow-dirty

[temeddix]

Thank you very much for your contribution :)