cmd/evm: adds ability to run individual state test file (#14998)

* cmd/evm: adds ability to run individual state test file

* cmd/evm: Fix statetest runner to be more json friendly

* cmd/evm, tests: minor polishes, dump state on fail

tests/state_test.go

@@ -50,7 +50,8 @@ func TestState(t *testing.T) {
 					t.Skip("constantinople not supported yet")
 				}
 				withTrace(t, test.gasLimit(subtest), func(vmconfig vm.Config) error {
-					return st.checkFailure(t, name, test.Run(subtest, vmconfig))
+					_, err := test.Run(subtest, vmconfig)
+					return st.checkFailure(t, name, err)
 				})
 			})
 		}