Implement Stats Refresh analytics events

[ghost]

Summary

Fixes #11730.

To test:

• Checkout the branch and confirm that existing tests pass, including those in WPAnalyticsTrackerAutomatticTracksTests.
• Review the code changes, and confirm that everything looks square.
• As a user, launch the app on-device or in the Simulator, logged in with Collect Information toggle enabled in Me : App Settings : Privacy Settings.
• Step through the Stats functionality, taking note that these events are logged* as expected.

It's probably easiest to validate events in one of the following two ways:

1. The event and properties are logged to the console here.
2. You can search for the events in post via Tracks Live View. Once the events are captured, be sure they are sent across the wire. This is easiest to accomplish by backgrounding the app, initiated here.

Update release notes:

• If there are user facing changes, I have added an item to RELEASE-NOTES.txt.

Discussion

Absent explicit requirements, it took some time & energy to distill the specific changes that needed to be made. For this reason, I've chosen to chronicle my approach below. Please advise if I missed something!

1. Examined the Android implementation of analytics; the PRs for these changes are noted in the issue.
2. Defined the net new events in WPAnalytics.h (see WordPressShared).
3. Absorbed these new events in WPiOS, ensuring that WPAnalytics.m prescribes eventName properties that match the aforementioned Android implementation.
4. Implemented the events below:

"Legacy" Events

• WPAnalyticsStatStatsInsightsAccessed
• WPAnalyticsStatStatsPeriodDaysAccessed
• WPAnalyticsStatStatsPeriodWeeksAccessed
• WPAnalyticsStatStatsPeriodMonthsAccessed
• WPAnalyticsStatStatsPeriodYearsAccessed
• WPAnalyticsStatStatsScrolledToBottom
• WPAnalyticsStatStatsSinglePostAccessed

Latest Post Summary Events

• WPAnalyticsStatStatsItemTappedLatestPostSummaryNewPost
• WPAnalyticsStatStatsItemTappedLatestPostSummaryPost
• WPAnalyticsStatStatsItemTappedLatestPostSummarySharePost
• WPAnalyticsStatStatsItemTappedLatestPostSummaryViewPostDetails

View More Events

• WPAnalyticsStatStatsViewAllAccessed (legacy event)
• WPAnalyticsStatStatsViewMoreTappedAuthors
• WPAnalyticsStatStatsViewMoreTappedClicks
• WPAnalyticsStatStatsViewMoreTappedComments
• WPAnalyticsStatStatsViewMoreTappedCountries
• WPAnalyticsStatStatsViewMoreTappedFollowers
• WPAnalyticsStatStatsViewMoreTappedLatestPostSummary
• WPAnalyticsStatStatsViewMoreTappedPostsAndPages
• WPAnalyticsStatStatsViewMoreTappedPublicize
• WPAnalyticsStatStatsViewMoreTappedReferrers
• WPAnalyticsStatStatsViewMoreTappedSearchTerms
• WPAnalyticsStatStatsViewMoreTappedTagsAndCategories
• WPAnalyticsStatStatsViewMoreTappedVideoPlays

Additional Row Selection Events

• WPAnalyticsStatStatsItemTappedAuthors
• WPAnalyticsStatStatsItemTappedClicks
• WPAnalyticsStatStatsItemTappedPostsAndPages
• WPAnalyticsStatStatsItemTappedSearchTerms
• WPAnalyticsStatStatsItemTappedSummaryPost
• WPAnalyticsStatStatsItemTappedTagsAndCategories
• WPAnalyticsStatStatsItemTappedVideoPlays

The following events required no changes:

• WPAnalyticsStatStatsAccessed, still implemented in BlogDetailsViewController.
• WPAnalyticsStatStatsOverviewBarChartTapped, implemented previously.

The following event(s) appear to be obsolete, and can be removed via #10975:

• WPAnalyticsStatStatsTappedBarChart

[ghost]

Once the backing PR in WordPressShared has been approved, we can initiate a new pod release and update the Podfile here to reference a proper version.

[ScoutHarris]

Thanks for the details in the description @stevebaranski . That's very helpful!

[ScoutHarris]

Hey Steve.

You can search for the events in post via Tracks Live View.

Are you sure dev tracks go there? I didn't see any. I used the Event Name wpios_stats% and only saw the legacy tracks from what appeared to be actual users. I didn't see any dev triggered tracks.

I do see them as Tracked in the logs, so I'm going to assume all is good, as I can't imagine why they wouldn't show in Tracks once published.

[ScoutHarris]

Looks good!

[ghost]

Thanks for the review, @ScoutHarris!

Are you sure dev tracks go there?

Yes, though there is generally some latency.

I took the liberty to express the same query for your username, and found some now. Hopefully that provides you some assurance that things are working as expected.

In any case, I'll merge this once I take care of versioning WordPressShared.

[ScoutHarris]

Yes, though there is generally some latency.

Ah! Apparently I wasn't patient enough. Thanks!