Implement `scroll_view` widget #54

Job	Run time
cargo fmt	11s
cargo clippy + test (windows-latest)	4m 31s
cargo doc (windows-latest)	58s
cargo clippy + test (macos-latest)	1m 34s
cargo clippy + test (ubuntu-latest)	1m 4s
cargo doc (macos-latest)	46s
cargo doc (ubuntu-latest)	33s
	9m 37s

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