[Databuckets] Add Zone Scoped Databuckets (#4690)

* [Databuckets] Add Zone Scoped Databuckets

* Add database indexes

* Update database_update_manifest.cpp

* Shutdown fix

* Testing

* Perf boost

* Revert "Perf boost"

This reverts commit 55d3e507d3.

* Update data_bucket.cpp

zone/zone_cli.h

@@ -6,6 +6,7 @@
 class ZoneCLI {
 public:
 	static void CommandHandler(int argc, char **argv);
+	static void BenchmarkDatabuckets(int argc, char **argv, argh::parser &cmd, std::string &description);
 	static void SidecarServeHttp(int argc, char **argv, argh::parser &cmd, std::string &description);
 	static bool RanConsoleCommand(int argc, char **argv);
 	static bool RanSidecarCommand(int argc, char **argv);