add maxwasmworkers option for test harness (#124)

configuration.go

@@ -55,6 +55,7 @@ type AdvancedOptions struct {
 	// Can be set to -1 to disable pre-allocated memory blocks entirely.
 	// This takes \sum_{k=5}^{n+5} 2^k memory usage
 	MaxMemoryAllocationBuckets int
+	MaxWasmWorkers             int
 }
 
 type DVCOptions struct {