Expose the summary for each ChangeDiff in the REST API

[jeremystretch]

Plugin Version

v0.2.0

Proposed functionality

Extend the JSON representation of a ChangeDiff to include the summary diff, indicating only which attributes have changed and their current and original values.

The format of this representation is yet to be determined, but could look something like this:

{
    "status": {
        "old": "staging",
        "new": "active"
    },
    "description": {
        "old": "",
        "new": "Foo bar"
    }
}

Use case

Although a ChangeDiff retrieved via the REST API currently includes the complete set of original, main, and branch data, a client would need to reconstruct the summary diff locally. Providing this data (which is already conveyed via the web UI) makes it directly consumable by the client.

External dependencies

No response