provide more info when key not found, such as:

```kotlin
   "Failure message states if key is missing, shows json array index out of bounds" {
      shouldFail {
         json.shouldContainJsonKeyValue("$.store.book[2].category", "V2")
      }.message shouldBe "Expected given to contain json key <'$.store.book[2].category'> but key was not found. The array at path <'$.store.book'> has size 2, so index 2 is out of bounds."
   }
```

or 

```kotlin
   "Failure message states if key is missing, shows json array index out of bounds when array is empty" {
      shouldFail {
         json.shouldContainJsonKeyValue("$.store.book[1].comments[0]", "V2")
      }.message shouldBe "Expected given to contain json key <'$.store.book[1].comments[0]'> but key was not found. The array at path <'$.store.book[1].comments'> has size 0, so index 0 is out of bounds."
   }
```