Ported all NUS download functions from libWiiPy and corresponding CLI commands

Also adds the basics of U8 archive packing/unpacking, however they are not in a usable state yet and there are no working CLI commands associated with them.

Cargo.toml

@@ -35,3 +35,4 @@ regex = "1"
 clap = { version = "4", features = ["derive"] }
 anyhow = "1"
 thiserror = "2"
+reqwest = { version = "0", features = ["blocking"] }