feat: mssql server summary

plugins/dbgate-plugin-mssql/src/backend/sql/listProcesses.js

@@ -0,0 +1,11 @@
+module.exports = `
+SELECT 
+  session_id as processId,
+  ISNULL(host_name, 'Unknown') + ':' + ISNULL(CAST(host_process_id AS VARCHAR(10)), '?') as client,
+  ISNULL(DB_NAME(database_id), 'master') as namespace,
+  ISNULL(DATEDIFF(SECOND, last_request_start_time, GETDATE()), 0) as runningTime,
+  status as state
+FROM sys.dm_exec_sessions 
+WHERE is_user_process = 1
+ORDER BY session_id
+`;