feat(components): [select-v2] add props attribute

[tolking]

This is a replica of #9817. related with #13263. close #11088

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Description

🤖 Generated by Copilot at a63f47a

This pull request adds a new feature to the SelectV2 component that allows users to customize the alias of the options sub-attributes (value, label, and disabled) using the props attribute. It also refactors the select-v2 component and its sub-components to use common utilities and hooks to handle the custom alias and improve the type inference and readability. It updates the documentation and the examples to reflect the new feature. It also simplifies some types and removes some redundant code.

Related Issue

Fixes #___.

Explanation of Changes

🤖 Generated by Copilot at a63f47a

• Add props attribute to SelectV2 component to customize the alias of the options sub-attributes (link, link, link, link)
• Use useProps hook to access the options data using the custom alias in various functions and components (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Use getValueKey function to generate unique keys for the options using the custom alias of the value attribute (link, link, link, link, link)
• Simplify Option type to extend Record<string, any> and remove OptionCommon and OptionGroup types (link, link, link)
• Use buildProps utility to wrap the SelectProps and OptionProps objects and improve type inference and readability (link)
• Use iconPropType utility for the clearIcon prop type (link)
• Use definePropType utility for the modelValue, options, and popperOptions prop types (link, link, link)
• Use useSizeProp hook for the size prop instead of the custom validator (link, link)
• Replace flattenOptions function with a reduce method to add a title and a group type for each option group (link)
• Use String constructor instead of toString method to avoid potential errors when the value is null or undefined (link, link)
• Remove getLabel function from useSelect as it is redundant with the useProps hook (link)
• Add docs/examples/select-v2/props.vue file to show an example of using the props attribute (link)
• Update docs/en-US/component/select-v2.md file to reflect the changes and add the props table (link, link)
• Delete packages/components/select-v2/src/util.ts file as it is no longer needed (link)

[github-actions]

[github-actions]

🧪 Playground Preview: https://element-plus.run/?pr=14536
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