Add a `Display` impl for `Vec2`, `Pos2`, and `Rect` #10997

Job	Run time
android	25s
Check wasm32 + wasm-bindgen	2m 32s
cargo-deny aarch64-apple-darwin	38s
cargo-deny aarch64-linux-android	38s
Format + check + test	5m 26s
cargo-deny i686-pc-windows-gnu	39s
cargo-deny i686-pc-windows-msvc	39s
cargo-deny i686-unknown-linux-gnu	38s
Check Windows	1m 41s
cargo-deny wasm32-unknown-unknown	38s
cargo-deny x86_64-apple-darwin	39s
cargo-deny x86_64-pc-windows-gnu	43s
cargo-deny x86_64-pc-windows-msvc	41s
cargo-deny x86_64-unknown-linux-gnu	42s
cargo-deny x86_64-unknown-linux-musl	46s
cargo-deny x86_64-unknown-redox	44s
	18m 9s

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