HarmonyOS 全局设置自定义字体的方法

参考示例：

onWindowStageCreate(windowStage: window.WindowStage): void {
  // Main window is created, set main page for this ability
  hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onWindowStageCreate');
  windowStage.loadContent('pages/Index', (err, data) => {
    windowStage.getMainWindow().then(res => {
      const uiCtc = res.getUIContext()
      uiCtc.getFont().registerFont({
        familyName: 'medium1',
        familySrc: $rawfile("AaYuanWeiTuSi-2.ttf")
      })
    })
    if (err.code) {
      hilog.error(0x0000, 'testTag', 'Failed to load the content. Cause: %{public}s', JSON.stringify(err) ?? '');
      return;
    }
    hilog.info(0x0000, 'testTag', 'Succeeded in loading the content. Data: %{public}s', JSON.stringify(data) ?? '');
  });
}

build() {
  Column() {
    Text(this.message)
      .fontSize(30)
      .fontFamily("medium1")
    Text(this.message)
      .fontSize(30)
  }.width('100%')
}