feat: mssql server summary

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

@@ -13,6 +13,9 @@ const viewColumns = require('./viewColumns');
 const indexes = require('./indexes');
 const indexcols = require('./indexcols');
 const triggers = require('./triggers');
+const listVariables = require('./listVariables');
+const listDatabases = require('./listDatabases');
+const listProcesses = require('./listProcesses');
 
 module.exports = {
   columns,
@@ -30,4 +33,7 @@ module.exports = {
   indexcols,
   tableSizes,
   triggers,
+  listVariables,
+  listDatabases,
+  listProcesses,
 };