feat(Textarea): expose autoResize method

[Ken-vdE]

Be able to call autoResize without forcefully triggering an Input (which could have other functional implications e.g. making api requests on input events).

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Say you have a Textarea containing text and the window is resized; the autoResize will not be triggered (there are other cases too).
This change will allow you to do something like this:

const resizeDebouncer = useDebounceFn(() => {
    textareaTemplateRef.value.autoResize();
}, 500);
onMounted(() => {
    window.addEventListener('resize', resizeDebouncer);
});
onUnmounted(() => {
    window.removeEventListener('resize', resizeDebouncer);
});

Without manually triggering, say, an input event, which could have other implications when using a manual @update:modelValue"...".

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[coderabbitai]

📝 Walkthrough

Walkthrough

The defineExpose block in the Textarea component has been modified to expose an additional internal function. The component now exposes both textareaRef and autoResize to external consumers, whereas previously only textareaRef was exposed. This change extends the public API surface of the component to include the resize functionality.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is clearly related to the changeset, explaining the rationale for exposing autoResize and providing usage examples of how it solves the problem of resizing without triggering input events.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The pull request title accurately and concisely describes the main change: exposing the autoResize method from the Textarea component's public API.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

📝 Coding Plan

• Generate coding plan for human review comments

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6120

commit: 0436aaa

[benjamincanac]

Looks good to me, however we need to update the ### Expose section in textarea.md.