Devenv Simplifies Rust Application Packaging in Nix

Devenv solves the problem of choosing a Rust application packaging tool in Nix. It simplifies development environment configuration with `languages.rust.enable`, providing tools like cargo and rustc. `languages.rust.import` uses crate2nix to package applications, eliminating the need for developers to choose between crate2nix, cargo2nix, and other tools. This unified interface extends to other languages, such as Python using uv2nix. Devenv automatically generates Nix expressions, streamlining the packaging and deployment of Rust applications and improving developer efficiency.