🐛 [Bug]: 非必要避免使用`getBoundingClientRect` api，复杂页面使用此导致强制重排影响性能

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Version

5.2.6

Vue Version

2.6.14

Link to minimal reproduction

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Step to reproduce

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What is expected

避免使用getBoundingClientRect api

What is actually happening

tiny-vue/packages/renderless/src/base-select/index.ts

Line 1723 in 791ae37

const inputClientRect = (inputEl && inputEl.getBoundingClientRect()) || {}

看了下面对此值的使用，只是获取元素宽高，建议替换成其他的实现

What is your project name

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Any additional comments (optional)

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Title: 🐛 [Bug]: Avoid using the getBoundingClientRect api unless necessary. Using this on complex pages will cause forced reflow and affect performance.