feat: add AREnableCollectorProfilePrompts

[iskounen]

This PR resolves DIA-713

Description

This PR adds AREnableCollectorProfilePrompts which will be used to build prompts to the user that will encourage them to update their profile or add artists to their collection after they perform commercial actions.

PR Checklist

• [ ] I have tested my changes on iOS and Android.
• [x] I hid my changes behind a [feature flag], or they don't need one.
• [x] I have included screenshots or videos, or I have not changed the UI.
• [x] I have added tests, or my changes don't require any.
• [x] I added an [app state migration], or my changes do not require one.
• [x] I have documented any follow-up work that this PR will require, or it does not require any.
• [x] I have added a changelog entry below, or my changes do not require one.

Changelog updates

### Changelog updates #### Dev changes - Added feature flag AREnableCollectorProfilePrompts

[ArtsyOpenSource]

	Warnings
:warning:	❌ **An error occurred while validating your changelog, please make sure you provided a valid changelog.**

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