Add an option to wrap console.warn in process.env.NODE_ENV governed conditional

```js
function foo () {
if (process.env.NODE_ENV === 'development') {
console.warn("Deprecated: Function \"foo\" is deprecated in /fixtures/preset-options/adds-console-warn-to-function-declaration/actual.js on line 4", {
functionName: "foo",
message: "Deprecated in favour of quux.",
packageName: "bar",
packageVersion: "1.0.0",
scriptColumn: 0,
scriptLine: 4,
scriptPath: "fixtures/preset-options/adds-console-warn-to-function-declaration/actual.js"
});
}

bar();
};

```

The use case is to allow this being used by libraries, where dependents on the library might want to disable the warnings in production.

Start with fixtures/preset-options/adds-console-warn-to-function-declaration/actual.js and trace how the plugin produces the shown console.warn output. Identify the option-handling and fixture path involved, then verify that the option controls the NODE_ENV conditional while the existing warning behavior remains unchanged.

Written by the indexing model from the issue text.