Allow querying for *last* gate change

[krowvin]

Query for a projects last known gate change

How do you go about getting the last gate change without specifying a large range, possibly pulled from the TS extents as a guess? (I don't think we have another way to determine the life of a project via API)

For example you have a project that had a gate change 7 years ago. Would I have to query 40 years of data just to be sure we get the last gate change? Maybe a feature request?

Suggest we add an endpoint that allows you to get the last gate change of a project and a cursor in that point in time (i.e. a page that lets you move backwards through the changes - assuming this is the latest)

[rma-rripken]

The GateChangeGetAllController has this description on the page-size parameter:

                        ```description = "the maximum number of gate changes to retrieve, regardless of time window. " +
                                "A positive integer is interpreted as the maximum number of changes from the " +
                                "beginning of the time window. A negative integer is interpreted as the maximum number " +
                                "from the end of the time window. " + "Default " + DEFAULT_PAGE_SIZE + "." +
                                "A page cursor will not be returned by this DTO. Instead, the next page can be determined " +
                                "by querying the next set of changes using the last returned change date and using " +
                                "start-time-inclusive=false")```

I think that means you can specify a long time-window ending now and a page-size of -1 and you will get the most recent change.

Are you already doing that and its not working?