databaseRunQueries(): accept a list of flags

This refactoring commit changes databaseRunQueries() to accept a list of
flags instead of separate memory and threads flags.

lib/codeql.js

@@ -472,12 +472,11 @@ async function getCodeQLForCmd(cmd, checkVersion) {
                 throw new Error(`Unexpected output from codeql resolve queries: ${e}`);
             }
         },
-        async databaseRunQueries(databasePath, extraSearchPath, querySuitePath, memoryFlag, threadsFlag) {
+        async databaseRunQueries(databasePath, extraSearchPath, querySuitePath, flags) {
             const codeqlArgs = [
                 "database",
                 "run-queries",
-                memoryFlag,
-                threadsFlag,
+                ...flags,
                 databasePath,
                 "--min-disk-free=1024",
                 "-v",