Add crashpad_database_util and its man page

tools/mac/on_demand_service_tool.mm

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 63 matching lines @@
     kOptionHelp = -2,
     kOptionVersion = -3,
   };
 
   struct {
     Operation operation;
     std::string job_label;
     std::vector<std::string> mach_services;
   } options = {};
 
-  const struct option long_options[] = {
+  const option long_options[] = {
       {"load", no_argument, nullptr, kOptionLoadJob},
       {"unload", no_argument, nullptr, kOptionUnloadJob},
       {"label", required_argument, nullptr, kOptionJobLabel},
       {"mach-service", required_argument, nullptr, kOptionMachService},
       {"help", no_argument, nullptr, kOptionHelp},
       {"version", no_argument, nullptr, kOptionVersion},
       {nullptr, 0, nullptr, 0},
   };
 
   int opt;
@@ skipping 93 matching lines @@
     }
   }
 }
 
 }  // namespace
 }  // namespace crashpad
 
 int main(int argc, char* argv[]) {
   return crashpad::OnDemandServiceToolMain(argc, argv);
 }