Tar entry labels and typeflag mappings.
This crate is part of the `use-archive` facade workspace. It provides tar-specific primitive labels only. It does not parse tar headers, read tar archives, write tar archives, or extract files.
```rust
use use_tar::TarEntryType;
assert_eq!(TarEntryType::from_typeflag(b'5'), TarEntryType::Directory);
assert_eq!(TarEntryType::Regular.typeflag(), Some(b'0'));
```