Add support for blurred rounded rectangle. #1509

Job	Run time
cargo check (msrv) (windows-latest)	1m 17s
cargo check (aarch64-android)	25s
cargo check (msrv) (macos-latest)	52s
cargo clippy (windows-latest)	2m 27s
cargo check (msrv) (wasm32)	39s
cargo clippy (macos-latest)	1m 15s
cargo check (msrv) (ubuntu-latest)	45s
cargo clippy (wasm32)	1m 23s
cargo clippy (ubuntu-latest)	1m 22s
cargo doc	1m 3s
cargo fmt	12s
Prime LFS Cache	4s
cargo test (wasm32)	25s
typos	5s
cargo test (windows-latest)	2m 12s
cargo test (macos-latest)	1m 14s
cargo test (ubuntu-latest)	3m 30s
	19m 10s

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