[ISSUE #29660] support empty keys with record selection

[maxi297]

What

Addresses #29660

How

Import/set dpath option when source package is being loaded

🚨 User Impact 🚨

Anyone who import the source package will also import dpath which might slow things a bit but we expect this to be negligible.

Else, we can not have record selection with body like this:

{
    "": "value for empty key",
    "data": [
        {
            "record_key": 1
        },
        {
            "record_key": 2
        }
    ]
}

[girarda]

lgtm