Implement `scroll_view` widget #79

Job	Run time
cargo clippy + test (windows-latest)	2m 32s
cargo doc (windows-latest)	1m 2s
cargo fmt	11s
cargo clippy + test (macos-latest)	1m 27s
cargo doc (macos-latest)	36s
cargo doc (ubuntu-latest)	34s
cargo clippy + test (ubuntu-latest)	1m 14s
	7m 36s

Provide feedback