Handle searching for matching elements in an array

Add unit tests.
Refactor internals to allow reusing assertion method for finding matches in an array.

ebean-test/src/test/resources/contains/array-multi-match-duplicate-props.json

@@ -0,0 +1,18 @@
+[
+  {
+    "b": 2,
+    "c": 3
+  },
+  {
+    "d": 4,
+    "e": 5
+  },
+  {
+    "a": 1,
+    "b": 2,
+    "c": 3
+  },
+  {
+    "b": 2
+  }
+]

ebean-test/src/test/resources/contains/array-multi-match.json

@@ -0,0 +1,20 @@
+[
+  {
+    "a": 1
+  },
+  {
+    "b": 2
+  },
+  {
+    "c": 3
+  },
+  {
+    "d": 4
+  },
+  {
+    "e": 5
+  },
+  {
+    "f": 6
+  }
+]

ebean-test/src/test/resources/contains/array-objects-shuffled.json

@@ -0,0 +1,14 @@
+[
+  {
+    "id": "tyu",
+    "c": 3
+  },
+  {
+    "id": "zxy",
+    "a": 1
+  },
+  {
+    "id": "123",
+    "b": 2
+  }
+]

ebean-test/src/test/resources/contains/array-objects.json

@@ -0,0 +1,11 @@
+[
+  {
+    "a": 1
+  },
+  {
+    "b": 2
+  },
+  {
+    "c": 3
+  }
+]

ebean-test/src/test/resources/contains/array-shuffled.json

@@ -1 +0,0 @@
-[2, 54, 13, 10]

ebean-test/src/test/resources/contains/array.json

@@ -1 +0,0 @@
-[10, 2, 13, 54]