Add benchmarks

tests/benchmark/benchmark_settings.py

@@ -0,0 +1,11 @@
+TRANSACTION_GENERATOR_EXCEPTION_LIMIT = 15
+"""
+The random transaction generator uses a set seed to generate transactions.
+However, not all transactions are valid in all contexts. We catch illegal
+generated transactions with a try/except, and retry until we generate a valid
+one. However, if we exceed this limit, something is likely wrong with the generator
+instead, due to the unlikely high number of exceptions.
+"""
+
+BENCHMARK_ITERATIONS = 5
+BENCHMARK_ROUNDS = 3