Move xplat/sonar/xplat/Sonar* to Flipper*

Summary:
Part of the Sonar -> Flipper rename
Intentionally left externally visible buck target as Sonar for now to minimize diff size.

Reviewed By: passy

Differential Revision: D9871684

fbshipit-source-id: 6926eb62c578a05cd895745c75ed7da3cfe965b5

xplat/Flipper/CertificateUtils.h

@@ -0,0 +1,20 @@
+/*
+ *  Copyright (c) 2004-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+#ifndef CertificateUtils_hpp
+#define CertificateUtils_hpp
+
+#include <openssl/pem.h>
+#include <openssl/rsa.h>
+#include <stdio.h>
+
+bool generateCertSigningRequest(
+    const char* appId,
+    const char* csrFile,
+    const char* privateKeyFile);
+
+#endif /* CertificateUtils_hpp */