[Recombee] Add internalAdditionalData field to actions

[mstieranka]

This PR adds a new field, internalAdditionalData, to all applicable actions within the Recombee destination.

The goal is for us to be able to track the types of events that are sent using our destination, and being able to use this data in our analytics, as well as assist our customers with any issues they may be having.

We set this new field up with unsafe_hidden set to true, as end users should never be able to modify the values within this field. If this parameter doesn't prevent the user from changing the values within this object, or if there's a better way to obtain $.type and $.event within actions, please let us know.

Additionally, the original additionalData field (that should be present to all users) has had its defaultObjectUI set to keyvalue:only, as we want to discourage users from setting the value of this field to be an entire object.

Testing

These changes were tested end-to-end to ensure the event data is sent in all applicable actions, and unit test snapshots were modified to account for the above-mentioned changes.

The new field is not required, meaning this is not a breaking change.

• Added unit tests for new functionality
• Tested end-to-end using the local server
• [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.