Add support for blurred rounded rectangle. #1513

Job	Run time
cargo check (aarch64-android)	27s
cargo check (msrv) (wasm32)	40s
cargo check (msrv) (windows-latest)	1m 15s
cargo clippy (windows-latest)	2m 28s
cargo check (msrv) (macos-latest)	33s
cargo clippy (wasm32)	1m 16s
cargo clippy (macos-latest)	1m 13s
cargo check (msrv) (ubuntu-latest)	46s
cargo doc	1m 8s
cargo clippy (ubuntu-latest)	1m 35s
cargo fmt	21s
Prime LFS Cache	4s
cargo test (wasm32)	27s
typos	5s
cargo test (windows-latest)	1m 42s
cargo test (macos-latest)	1m 2s
cargo test (ubuntu-latest)	2m 58s
	18m 0s

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