Add support for blurred rounded rectangle. #1512

Job	Run time
cargo check (aarch64-android)	21s
cargo clippy (windows-latest)	2m 30s
cargo check (msrv) (wasm32)	43s
cargo clippy (macos-latest)	58s
cargo check (msrv) (windows-latest)	1m 26s
cargo clippy (ubuntu-latest)	1m 28s
cargo check (msrv) (macos-latest)	39s
cargo clippy (wasm32)	1m 16s
cargo check (msrv) (ubuntu-latest)	1m 4s
cargo doc	1m 2s
cargo fmt	25s
cargo test (wasm32)	29s
Prime LFS Cache	10s
typos	5s
cargo test (windows-latest)	1m 47s
cargo test (macos-latest)	1m 17s
cargo test (ubuntu-latest)	3m 23s
	19m 3s

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