Support tarballs with the GNU Sparse File extension

[chshersh]

Currently, tool-sync can't support some tools because their macOS archives use the GNU Sparse File feature:

tool-sync/src/sync/db.rs

Lines 99 to 110 in b79eeb9

	// tools.insert("tokei", ToolInfo {
	// owner: "XAMPPRocky".to_string(),
	// repo: "tokei".to_string(),
	// exe_name: "tokei".to_string(),
	// asset_name: AssetName {
	// linux: Some("x86_64-unknown-linux-musl".to_string()),
	// macos: Some("apple-darwin".to_string()),
	// windows: Some("x86_64-pc-windows-msvc".to_string()),
	// }
	// tag: ToolInfoTag::Latest,
	// }));
	//

This is blocked by the following issue in tar crate:

• Bug: Extracting tar failed due to GNU Sparse File extension not properly supported alexcrichton/tar-rs#295