Implement `scroll_view` widget #53

Job	Run time
cargo clippy + test (windows-latest)	5m 54s
cargo doc (windows-latest)	3m 9s
cargo clippy + test (macos-latest)	6m 53s
cargo fmt	9s
cargo doc (macos-latest)	1m 38s
cargo clippy + test (ubuntu-latest)	4m 12s
cargo doc (ubuntu-latest)	1m 34s
	23m 29s

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