Components: New form primitives

[mirka]

Part of #71196

These are the new primitive components for form-related UI, to be added to the @wordpress/ui package. Primitives will be composed to build up to a *Control component (e.g. InputControl), comparable to the @wordpress/components equivalent.

• Field Add Field primitives #74190
• Fieldset UI: Add Fieldset primitives #74296
• InputLayout
• Input
• Textarea
• Select
• Combobox
• SearchableSelect
• SearchableChipSelect
• Checkbox
• CheckboxGroup
• Radio
• RadioGroup
• Switch
• Slider
• ToggleGroup