add support for disabling anti-aliasing in BitmapBackend #429

Job	Run time
run_all_examples	19s
cargo-doc	33s
test_all_features	58s
msrv	13s
build_and_test (macos-latest)	26s
build_and_test (ubuntu-latest)	23s
build_and_test (windows-latest)	28s
	3m 20s

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