Implement `scroll_view` widget #47

Job	Run time
cargo fmt	15s
cargo doc (windows-latest)	2m 41s
cargo clippy + test (windows-latest)	1m 32s
cargo doc (macos-latest)	3m 25s
cargo clippy + test (macos-latest)	1m 38s
cargo doc (ubuntu-latest)	39s
cargo clippy + test (ubuntu-latest)	1m 27s
	11m 37s

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