feat: Identity alias

[kyle-ssg]

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• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

• Allows you to specify an alias for identities
• The flagsmith app will now start identifying by id rather than email

How did you test this code?

_

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Name	Status	Preview	Comments	Updated (UTC)
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 2, 2024 3:00pm
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 2, 2024 3:00pm

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Oct 2, 2024 3:00pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4620	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4620	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4620	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4620	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4620	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4620	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-56166 was deleted.

[flagsmith]

Flagsmith Feature identity_aliases has been updated:

Segment flagsmith_team values:

Environment	Enabled	Value	Last Updated (UTC)
Production	❌ Disabled		2024-10-02 14:07:22

[matthewelwell]

I'm approving this. The only remaining thing I noticed was that we still show the alias on the list page even when the flag is disabled.

I don't see this as a particular issue, since it's obviously not possible to set an alias without the flag being enabled, but it might be odd if we subsequently want to turn the flag off again in a future situation.

[flagsmith]

Flagsmith Feature identity_aliases has been updated:

Segment flagsmith_team values:

Environment	Enabled	Value	Last Updated (UTC)
Production	✅ Enabled		2024-10-02 14:16:05

[flagsmith]

Flagsmith Feature identity_aliases has been updated:

Environment	Enabled	Value	Last Updated (UTC)
Demo	✅ Enabled		2024-10-02 16:01:54

[flagsmith]

Flagsmith Feature identity_aliases has been updated:

Segment org_segment_skai values:

Environment	Enabled	Value	Last Updated (UTC)
Production	✅ Enabled		2024-10-04 08:41:33

[flagsmith]

Flagsmith Feature identity_aliases has been updated:

Segment org_segment_wistia values:

Environment	Enabled	Value	Last Updated (UTC)
Production	✅ Enabled		2024-10-09 14:38:18