Support for ContentTopic in ComplianceEvents

When content is shared, commented or liked from  "What people are talking about now" section on Linkedin.com application, the target of the activity is a ContentTopic Urn of type "urn:li:contentTopic:{id}" . This object is now expanded in Compliance Events API. The schema and example output is shown below.

ContentTopic URN Schema

Field Name	Object Type	Description
auditStamps	optional AuditStamp	ChangeAuditStamps for this ContentTopic.
headline	optional string	A one-liner description of what this ContentTopic is about.
id	long	The id of this content topic.
imageUrn	optional DigitalmediaAssetUrn	An image urn associated with this content topic.
locale	optional Locale	The Locale for the String fields (name, headline, summary)
name	string	The name of this content topic
state	optional enum string	The state of the content topic. Used to denote where in the workflow this content topic is. Can be one of following: DRAFT: This interest is not ready for prime time yet. It is a work in progress ACTIVE*: This interest is active. LinkedIn members can interact with it. EXPIRED: An editor has determined that this Interest is expired, or no longer relevant to any member. FLAGGED: This interest is flagged for review. Most likely the items in the Interest Feed are spammy / low quality / offensive *In Compliance Events API scenario, you should only experience: ACTIVE.
summary	optional string	A short description of what this ContentTopic is about. Usually no more than a paragraph.

schema format of Content Topic urn decoration response

{
    "object": "urn:li:contentTopic:1234567", 
    "object~": {
        "auditStamps": {
            "created": {
                "actor": "urn:li:person:XXXXX", 
                "time": 1533174398091
            }, 
            "lastModified": {
                "actor": "urn:li:person:XXXXX", 
                "time": 1533178068519
            }
        }, 
        "headline": "Testing ContentTopic", 
        "id": 1234567, 
        "imageUrn": "urn:li:digitalmediaAsset:C4E1AAQFOlhSrzsV6GQ", 
        "locale": {
            "country": "US", 
            "language": "en"
        }, 
        "name": "Test ContentTopic", 
        "state": "ACTIVE", 
        "summary": "<p>This is a test content"
    }
}

ContentTopic URNs appear mostly in object fields in Social Actions and UGC Post resources.