如何设置Text的字体，可以不受系统设置里显示字体大小的影响
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目前，px2fp()和px2vp()等方法在修改系统显示大小后不会实时更新。字体的默认单位是 fp，界面像素单位是 px，可以使用像素单位来设置字体大小。参考如下：

@Entry
@Component
struct CustomFontSetting {
  @State message: string = 'hello world';

  build() {
    Column() {
      Text(this.message)
        .fontSize(53) _// Default unit is fp, which changes with system display size._
      Text(this.message)
        .fontSize(this.getUIContext().fp2px(160) + 'px') _// Use pixel units, unaffected by system display size._
      Blank()
        .color(0xff0000)
        .height(30)
        .width(226)
        .margin({ bottom: 20 }) _// Default unit vp changes with system display size._
      Blank()
        .color(0xff0000)
        .height(30 + 'px')
        .width(this.getUIContext().vp2px(672) + 'px') _// Use pixel units, unaffected by system display size._
    }
  }
}