ARRAYCONTAINS support of Array of Structs

Hi,

I'm using Confluent [cp-all-in-one with docker](https://docs.confluent.io/current/quickstart/cos-docker-quickstart.html) (v5.4.1), and I'm confused on how to use ARRAYCONTAINS (or another feature) for Arrays of Structs.
Regarding the example below, is there a way, currently supported by Confluent in KSQL, to create a STREAM that filters on records that have at least one friend with "first_name" = "John" ?

Example of record (the array "myNiceArrayOfFriends has 2 entries with "first_name" = "John" :

```
"myFirstField": (...),
"myNiceArrayOfFriends": [
{
"id": "0",
"name": {
"first_name": "John",
"last_name": "Doe"
}
},
{
"id": "1",
"name": {
"first_name": "Jane",
"last_name": "Doe"
}
},
{
"id": "2",
"name": {
"first_name": "John",
"last_name": "Lennon"
}
}
],
"someOtherField": (...)
```

Start by checking the documented ARRAYCONTAINS behavior and KSQL query support for arrays of structs, using the example record in the issue as the reproduction case. Determine whether filtering on a nested first_name is supported; if not, identify the relevant query-language entry point and tests needed to define the feature and its expected result.

Written by the indexing model from the issue text.