Referrals: Add analytics

[SergioEstevao]

| 📘 Part of: #2083 |
|:---:|

Fixes #

To test

1. Configure the podcast scheme to use the StoreKit Configuration file: Pocket Casts Configuration.storekit
2. Delete the app from the simulator if you already have it installed
3. Start the app
4. Ensure that you have the referrals FF enabled
5. Ensure that you have tracks logging enabled in the FF

Share Guest Pass

1. Login with an account that has an Plus or Patron active
2. Go to Profile
3. You should see the referral tip/hint on top. Check event: referral_tooltip_show
4. Tap on the gift icon on the top left. Check event: referral_tooltip_tapped and referral_share_screen_show
5. Tap on the Send Pass. Check event: referral_share_screen_show
6. Send the URL to the reminders app
7. Save it in Reminders

Claim Guest Pass

1. Now login with an account that doesn't have a subscription
2. Switch to the Reminders app
3. Tap on the referral URL
4. The PocketCasts app should open an show the claim guest pass screen. Check event: referral_claim_screen_show
5. Tap on Not Now. Check event: referral_not_now_tapped
6. Switch to Profile Tab if needed. You should see the claim banner on profile. Check event: referral_pass_banner_show
7. Tap on the banner
8. Tap on Activate Pass. Check event: referral_activate_tapped
9. You should see a loading item on the button
10. Then you should see the IAP screen. Check event: referral_purchase_show
11. Purchase the subscription ( This is using Xcode IAP simulator so no need to insert card). Check event: referral_purchase_success
12. The flow should finish and return you to main screen

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[bjtitus]

Verified all events ✔️

✅ referral_tooltip_show
✅ referral_share_screen_show
✅ referral_tooltip_tapped

✅ referral_claim_screen_show
✅ referral_not_now_tapped
✅ referral_pass_banner_show
✅ referral_activate_tapped
✅ referral_purchase_show
✅ referral_purchase_success