Add support for form schema property setting textarea rows value

[d10sfan]

This adds an ability to set the initial rows setting for the textarea, instead of it being hard-coded to 1. This allows you to then pass into the form widget the following schema:

{
	"properties": {
		"first_name": {
			"type": "string",
			"description": "your name",
			"default": "default",
                        "rows": 10
		}
	},
	"required": []
}

The main use case here is that if you have a large value on the form, being able to set the rows allows to have it expanded by default, instead of the user only seeing 1 line of a very large string. Let me know if there's any better places to put the config.

Fixes #3758

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🚀 This description was created by Ellipsis for commit a8dc506

Summary:

Enhanced textarea in LightweightArgInput.svelte to support dynamic rows setting from schema, improving UX for larger text inputs.

Key points:

• Updated LightweightArgInput.svelte to dynamically set textarea rows from schema.
• Uses extra?.['rows'] || 1 to determine rows count, defaulting to 1 if not specified.
• Enhances UX for larger text inputs by not limiting to a single row.

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[d10sfan]

I have read the CLA Document and I hereby sign the CLA

[d10sfan]

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