HarmonyOS 拨打电话功能

参考示例如下：

import call from '@ohos.telephony.call';
import { BusinessError } from '@ohos.base';

function startCallDialog(): void {
  let isSupport = call.hasVoiceCapability();
  if (!isSupport) {
    console.error('Not support voice capability.');
    return;
  }
  call.makeCall('电话号码', (err: BusinessError) => {
    if (err) {
      console.error(`Failed to make call. Code is ${err.code}, Message is ${err.message}`);
      return;
    }
    console.info('Succeeded in making call.');
  })
}

@Entry
@Component
struct Phone {
  build() {
    Row() {
      Column() {
        Button('拨打电话')
          .onClick(() => {
            startCallDialog();
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}
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