Implement `scroll_view` widget #48

Job	Run time
cargo fmt	10s
cargo doc (windows-latest)	1m 50s
cargo clippy + test (windows-latest)	4m 48s
cargo doc (macos-latest)	37s
cargo clippy + test (macos-latest)	4m 13s
cargo doc (ubuntu-latest)	36s
cargo clippy + test (ubuntu-latest)	3m 40s
	15m 54s

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