New Stats: Analytics

[kean]

Add analytics for JetpackStats. The way it works, JetpackStats sends new StatsEvent via new StatsTracker. The app has an adapter that uses WPAnalyticsEvent to map and track these. I considered using StatsEvent as raw string values, but I think this is clearer (and it was all auto-generated anyway so I didn't have to spent time writing it).

I also added a new new_stats field to the existing stats_accessed event:

🔵 Tracked: stats_accessed <blog_id: 239619264, new_stats: 1, site_type: blog, tab_source: site_menu, tap_source: row>

[dangermattic]

	2 Warnings
⚠️	View files have been modified, but no screenshot or video is included in the pull request. Consider adding some for clarity.
⚠️	This PR is larger than 500 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

Generated by 🚫 Danger

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	28332
	Version	PR #24702
	Bundle ID	org.wordpress.alpha
	Commit	08796e3
	Installation URL	0hnpqetnrlkig

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	28332
	Version	PR #24702
	Bundle ID	com.jetpack.alpha
	Commit	08796e3
	Installation URL	3crk5udnkkifo

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.