iOS: Support putting UI next to the dynamic island #13100

Job	Run time
Check wasm32 + wasm-bindgen	2m 21s
Check wasm32+atomics	1m 23s
Format + check + test	2m 30s
android	29s
ios	19s
cargo-deny aarch64-apple-darwin	45s
Run tests	1m 44s
cargo-deny aarch64-linux-android	46s
cargo-deny i686-pc-windows-gnu	39s
Check Windows	1m 48s
cargo-deny i686-pc-windows-msvc	43s
cargo-deny i686-unknown-linux-gnu	36s
cargo-deny wasm32-unknown-unknown	50s
cargo-deny x86_64-apple-darwin	53s
cargo-deny x86_64-pc-windows-gnu	41s
cargo-deny x86_64-pc-windows-msvc	41s
cargo-deny x86_64-unknown-linux-gnu	38s
cargo-deny x86_64-unknown-linux-musl	41s
cargo-deny x86_64-unknown-redox	41s
	19m 8s

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