refactor：简化头像计算，新增头像最大尺寸参数，避免头像裁剪出来太大 || refactor: Simplify the avatar calculation and add a new avatar. Maximum size parameter to prevent the avatar from being cropped too large

[hxg2050]

使用的时候遇到提示文件太大，但是手机上的照片动辄10m+,优化了一下裁剪头像，现在选择本地图片可以选择更大的图片了

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When using it, I encountered a prompt that the file is too large, but the photos on the mobile phone are often 10m+. I have optimized the cropped avatar. Now you can choose a larger image when selecting a local image.

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[moonrailgun]

I dont know why you continue wanna change algorithm

This pr has two problem:

• the safe area algorithm is to make sure the behavior of crop and rotate logic is work fine and not lost information. i dont know why you wanna delete it, because it looks like you just wanna set a max width to make sure image size is safe.
• and you should pass your props(maxSize in your code) from avatar picker into this crop function. if you just only add a param, its will not be work.

if you can not cover it, free feel to tell me, i can merge it and change this logic work fine