Use ProfileID instead of Email for image upload option

[etoledom]

Closes GRA-439

Description

On this PR we deprecate AvatarSelection in favor of AvatarUploadSelectionPolicy.

The reason being AvatarSelection requires an Email, which is not always available, specially when authenticating through OAuth. AvatarUploadSelectionPolicy requires ProfileIdentifier which can be instantiated with an Email or a Email Hash. The hash can be retrieved directly from the Profile object.

Testing Steps

• Smoke test Image upload demo screen
• Smoke test uploading avatars in the Quick Editor demo

[wpmobilebot]

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

	App Name	Gravatar Prototype Build
	Build Number	2451
	Version	PR #792
	Bundle ID	com.automattic.gravatar-sdk-demo-uikit.prototype-build
	Commit	356d43d
	Installation URL	3p80k2h8e1638

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

[pinarol]

Looks and works good 🎉