检测 iOS App 是否 TestFlight 下载的 ipa

Judge iOS app is Running TestFlight Beta.swift

OC
```
if ([[NSBundle mainBundle] pathForResource:@"embedded" ofType:@"mobileprovision"]) {
    // TestFlight
} else {
    // App Store (and Apple reviewers too)
}

BOOL isRunningTestFlightBeta = [[[[NSBundle mainBundle] appStoreReceiptURL] lastPathComponent] isEqualToString:@"sandboxReceipt"];
```

Swift
```
/// 是否是 testflight包
public static var isTestFlight: Bool {
    return isAppStoreReceiptSandbox && !hasEmbeddedMobileProvision
 }
 
/// 是否是 Appstore 包
 public static var isAppStore: Bool {
     if isAppStoreReceiptSandbox || hasEmbeddedMobileProvision {
      return false
     }
     return true
 }
 
 fileprivate static var isAppStoreReceiptSandbox: Bool {
     let b = Bundle.main.appStoreReceiptURL?.lastPathComponent == "sandboxReceipt"
     NSLog("isAppStoreReceiptSandbox: \(b)")
    return b
 }
 
 fileprivate static var hasEmbeddedMobileProvision: Bool {
    let b = Bundle.main.path(forResource: "embedded", ofType: "mobileprovision") != nil
    NSLog("hasEmbeddedMobileProvision: \(b)")
    return b
 }
```