Implement `scroll_view` widget #110

Job	Run time
cargo fmt	11s
cargo clippy + test (windows-latest)	2m 8s
cargo doc (windows-latest)	3m 11s
cargo clippy + test (macos-latest)	2m 37s
cargo doc (macos-latest)	2m 47s
cargo clippy + test (ubuntu-latest)	1m 13s
cargo doc (ubuntu-latest)	1m 39s
	13m 46s

Provide feedback