Integrate PHPickerViewController in Gravatar flow

[kean]

Part of #21190.

• Update the Gravatar flows to use PHPickerViewController
• Adds support for WebP (the existing solution doesn’t support it)

Tests

Important

• Enable the "Native Photo Picker" feature flag before testing

Update Gravatar (Profile)

• Open "My Profile"
• Tap “Take Photo”
• Verify that the front facing camera opens by default
• Take a photo and verify that crop screen opens
• Crop and use the photo; verify that it gets uploaded

Verify that the "Choose from Device" flow also works

Creating new Account

• Create a new account with email
• Verify the same "Update Gravatar" steps from the first test

This is the screen/flow you are looking for:

Simulator.Screen.Recording.-.iPhone.14.Pro.-.2023-08-22.at.10.35.01.mp4

Regression Notes

1. Potential unintended areas of impact: Gravatar update flow
2. What I did to test those areas of impact (or what existing automated tests I relied on): manual
3. What automated tests I added (or what prevented me from doing so): h/a

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

UI Changes testing checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[kean]

Just removing the IB actions so that I could set them programatically.

[wpmobilebot]

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

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr21388-3f4c73d
	Version	23.0
	Bundle ID	org.wordpress.alpha
	Commit	3f4c73d
	App Center Build	WPiOS - One-Offs #6816

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[wpmobilebot]

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

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr21388-3f4c73d
	Version	23.0
	Bundle ID	com.jetpack.alpha
	Commit	3f4c73d
	App Center Build	jetpack-installable-builds #5857

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

[momo-ozawa]

Works as described, tested webp as well