Overload operators for `Rect + Margin`, `Rect - Margin` etc #10401

Job	Run time
android	26s
Check wasm32 + wasm-bindgen	2m 20s
Format + check + test	5m 47s
cargo-deny aarch64-apple-darwin	44s
cargo-deny aarch64-linux-android	42s
Check Windows	2m 17s
cargo-deny i686-pc-windows-gnu	39s
cargo-deny i686-pc-windows-msvc	46s
cargo-deny i686-unknown-linux-gnu	40s
cargo-deny wasm32-unknown-unknown	41s
cargo-deny x86_64-apple-darwin	45s
cargo-deny x86_64-pc-windows-gnu	41s
cargo-deny x86_64-pc-windows-msvc	39s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	41s
cargo-deny x86_64-unknown-redox	37s
	19m 4s

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