Fix handling of release option

[dannymcgee]

Previously, the generators had been creating project configurations that looked like this:

{
  // ...
  "targets": {
    "build": {
      "executor": "@nxrs/cargo:build",
      "options": {
        "release": false
      },
      "configurations": {
        "production": {
          "release": true
        }
      }
    }
// ...

The release option was passed straight through to Cargo as a command line argument, but Cargo's --release flag is just an alias for --profile release, and passing --release false would cause Cargo to fail.

This update changes the default generated project configurations to use --profile dev by default and --profile release for production, and updates the argument parsing logic to handle the release option without erroring when it is present.