Implement `scroll_view` widget #57

Job	Run time
cargo fmt	11s
cargo doc (windows-latest)	1m 7s
cargo doc (macos-latest)	53s
cargo clippy + test (windows-latest)	2m 29s
cargo clippy + test (macos-latest)	1m 50s
cargo doc (ubuntu-latest)	35s
cargo clippy + test (ubuntu-latest)	1m 6s
	8m 11s

Provide feedback