Add support for showing other metrics in the terminal

tests/snapshots/integration_tests__json_export_basic.snap

@@ -8,8 +8,8 @@ info:
     - "--export-json=-"
     - "--runs=2"
     - "--warmup=1"
-    - "--reference-name=one second"
-    - "--reference=sleep 1"
+    - "--command-name=one second"
+    - sleep 1
     - "--command-name=sleep 2"
     - sleep 2
 ---
@@ -27,6 +27,7 @@ exit_code: 0
       "architecture": "[architecture]"
     }
   },
+  "primary_metric": "time_wall_clock",
   "results": [
     {
       "command": "sleep 1",
@@ -71,19 +72,9 @@ exit_code: 0
           "exit_code": 0
         }
       ],
-      "is_reference": true,
       "summary": {
-        "time_wall_clock": {
-          "unit": "second",
-          "count": 2,
-          "mean": 1.0,
-          "stddev": 0.0,
-          "median": 1.0,
-          "min": 1.0,
-          "max": 1.0
-        },
-        "time_user": {
-          "unit": "second",
+        "memory_peak_resident": {
+          "unit": "byte",
           "count": 2,
           "mean": 0.0,
           "stddev": 0.0,
@@ -100,14 +91,23 @@ exit_code: 0
           "min": 0.0,
           "max": 0.0
         },
-        "memory_peak_resident": {
-          "unit": "byte",
+        "time_user": {
+          "unit": "second",
           "count": 2,
           "mean": 0.0,
           "stddev": 0.0,
           "median": 0.0,
           "min": 0.0,
           "max": 0.0
+        },
+        "time_wall_clock": {
+          "unit": "second",
+          "count": 2,
+          "mean": 1.0,
+          "stddev": 0.0,
+          "median": 1.0,
+          "min": 1.0,
+          "max": 1.0
         }
       }
     },
@@ -154,17 +154,8 @@ exit_code: 0
         }
       ],
       "summary": {
-        "time_wall_clock": {
-          "unit": "second",
-          "count": 2,
-          "mean": 2.0,
-          "stddev": 0.0,
-          "median": 2.0,
-          "min": 2.0,
-          "max": 2.0
-        },
-        "time_user": {
-          "unit": "second",
+        "memory_peak_resident": {
+          "unit": "byte",
           "count": 2,
           "mean": 0.0,
           "stddev": 0.0,
@@ -181,14 +172,23 @@ exit_code: 0
           "min": 0.0,
           "max": 0.0
         },
-        "memory_peak_resident": {
-          "unit": "byte",
+        "time_user": {
+          "unit": "second",
           "count": 2,
           "mean": 0.0,
           "stddev": 0.0,
           "median": 0.0,
           "min": 0.0,
           "max": 0.0
+        },
+        "time_wall_clock": {
+          "unit": "second",
+          "count": 2,
+          "mean": 2.0,
+          "stddev": 0.0,
+          "median": 2.0,
+          "min": 2.0,
+          "max": 2.0
         }
       }
     }