Test `DrawColor` endianness and premultiplication #1991

Job	Run time
cargo check (aarch64-android)	24s
cargo clippy (windows-latest)	2m 0s
cargo clippy (macos-latest)	1m 0s
cargo check (msrv) (windows-latest)	1m 26s
cargo clippy (ubuntu-latest)	1m 13s
cargo check (msrv) (wasm32)	38s
cargo clippy (wasm32)	1m 13s
cargo check (msrv) (macos-latest)	38s
cargo check (msrv) (ubuntu-latest)	56s
cargo doc	26s
formatting	30s
Prime LFS Cache	7s
cargo test (wasm32)	29s
typos	3s
cargo test (windows-latest)	3m 9s
cargo test (macos-latest)	1m 31s
cargo test (ubuntu-latest)	2m 48s
	18m 31s

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