Fix span event serialization for array attributes (#5490)

Author: marcotc

packages/dd-trace/src/encode/0.4.js

@@ -395,7 +395,7 @@ function convertSpanEventAttributeValues (key, value, depth = 0) {
       if (convertedArray.length > 0) {
         return {
           type: 4,
-          array_value: convertedArray
+          array_value: { values: convertedArray }
         }
       } else {
         // If all elements were unsupported, return undefined

packages/dd-trace/test/encode/0.4.spec.js

@@ -522,12 +522,14 @@ describe('encode', () => {
             rating: { type: 3, double_value: 9.8 },
             other: {
               type: 4,
-              array_value: [
-                { type: 0, string_value: 'hi' },
-                { type: 1, bool_value: false },
-                { type: 2, int_value: 1 },
-                { type: 3, double_value: 1.2 }
-              ]
+              array_value: {
+                values: [
+                  { type: 0, string_value: 'hi' },
+                  { type: 1, bool_value: false },
+                  { type: 2, int_value: 1 },
+                  { type: 3, double_value: 1.2 }
+                ]
+              }
             }
           }
         }
@@ -568,7 +570,7 @@ describe('encode', () => {
         {
           name: 'I can sing!!!',
           time_unix_nano: 1633023102000000,
-          attributes: { array: { type: 4, array_value: [{ type: 0, string_value: 'valid_value' }] } }
+          attributes: { array: { type: 4, array_value: { values: [{ type: 0, string_value: 'valid_value' }] } } }
         }
       ]