[Plugin] Add BE plugin framework (#2348) (#2618)

Support BE plugin framework, include:

* update Plugin Manager, support Plugin find method
* support Builtin-Plugin register method

* plugin install/uninstall process
	* PluginLoader:
		* dynamic install and check Plugin .so file
		* dynamic uninstall and check Plugin status
	* PluginZip:
		* support plugin remote/local .zip file download and extract

TODO:

* We should support a PluginContext to transmit necessary system variable when the plugin's init/close method invoke

* Add the entry which is BE dynamic Plugin install/uninstall process, include:
	* The FE send install/uninstall Plugin statement (RPC way)
	* The FE meta update request with Plugin list information
	* The FE operation request(update/query) with Plugin (maybe don't need)

* Add the plugin status upload way
* Load already install Plugin when BE start

be/src/runtime/exec_env_init.cpp

@@ -61,6 +61,7 @@
 #include "gen_cpp/TExtDataSourceService.h"
 #include "gen_cpp/HeartbeatService_types.h"
 #include "runtime/heartbeat_flags.h"
+#include "plugin/plugin_mgr.h"
 
 namespace doris {
 
@@ -103,6 +104,7 @@ Status ExecEnv::_init(const std::vector<StorePath>& store_paths) {
     _stream_load_executor = new StreamLoadExecutor(this);
     _routine_load_task_executor = new RoutineLoadTaskExecutor(this);
     _small_file_mgr = new SmallFileMgr(this, config::small_file_dir);
+    _plugin_mgr = new PluginMgr();
 
     _backend_client_cache->init_metrics(DorisMetrics::metrics(), "backend");
     _frontend_client_cache->init_metrics(DorisMetrics::metrics(), "frontend");