Make `Area` state public #11422

Job	Run time
android	22s
Check wasm32 + wasm-bindgen	2m 31s
cargo-deny aarch64-apple-darwin	42s
Format + check + test	5m 52s
cargo-deny aarch64-linux-android	41s
cargo-deny i686-pc-windows-gnu	39s
cargo-deny i686-pc-windows-msvc	41s
Check Windows	1m 54s
cargo-deny i686-unknown-linux-gnu	41s
cargo-deny wasm32-unknown-unknown	42s
cargo-deny x86_64-apple-darwin	41s
cargo-deny x86_64-pc-windows-gnu	40s
cargo-deny x86_64-pc-windows-msvc	40s
cargo-deny x86_64-unknown-linux-gnu	39s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-redox	39s
	18m 43s

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