Implement `scroll_view` widget #107

Job	Run time
cargo fmt	15s
cargo doc (windows-latest)	2m 54s
cargo clippy + test (windows-latest)	1m 28s
cargo doc (macos-latest)	2m 50s
cargo clippy + test (macos-latest)	1m 44s
cargo clippy + test (ubuntu-latest)	1m 23s
cargo doc (ubuntu-latest)	1m 33s
	12m 7s

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