Add pixels to track Duck Player usage

[ayoy]

Task/Issue URL: https://app.asana.com/0/1177771139624306/1207208910013350/f

Description:
This change updates existing Duck Player pixels and adds a bunch of new pixels.

Steps to test this PR:
List of all pixels
Run the app from Xcode and verify that pixels are sent as expected:

1. Go to Duck Player settings, verify that a pixel is sent whenever you update Duck Player mode.
2. Set the mode to "Show option ...".
3. Open some youtube video page (so that the overlay is shown). Verify that m_mac_duck-player_overlay_youtube_impressions is sent.
4. Click "Watch Here". Verify that m_mac_duck-player_overlay_youtube_watch_here is sent.
5. Reload the website. Check "Remember my choice" and click "Watch in Duck Player". Verify that m_mac_duck-player_setting_always_overlay_youtube is sent.
6. Revert Duck Player mode to "Show option ...".
7. Search for something and go to Videos vertical. Click on any video.
8. Check "Remember my choice" and click "Watch in Duck Player". Verify that m_mac_duck-player_setting_always_overlay_serp is sent.
9. Revert Duck Player mode to "Show option ...".
10. Open any video in Duck Player. From Duck Player interface check "Always open YouTube videos in Duck Player" and wait until the checkbox disappears. Verify that m_mac_duck-player_setting_always_duck-player is fired.
11. Throughout your testing you'll see m_mac_duck-player_daily-unique-view being logged to console on every Duck Player page load. Verify that it contains "setting" parameter describing current Duck Player mode ("always" or "default").

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Internal references:

Pull Request Review Checklist
Software Engineering Expectations
Technical Design Template
Pull Request Documentation

[SabrinaTardio]

LGTM works as expected.
Just a couple of non blocking nit