chore: rename crate to coz-rs for crates.io

The name 'coz' is already taken on crates.io.

Author: nrdxp

Cargo.toml

@@ -4,7 +4,7 @@ description  = "Coz cryptographic JSON messaging specification"
 edition      = "2024"
 keywords     = ["cryptography", "json", "signature", "authentication"]
 license      = "BSD-3-Clause"
-name         = "coz"
+name         = "coz-rs"
 repository   = "https://github.com/Cyphrme/coz-rust"
 rust-version = "1.85"
 version      = "0.1.0"