Description

This PR adds new identity hooks. This is part of a wider effort to make sure that mobile has the same logic that extension has regarding auth & profile syncing. Note that this PR, as being part 1 of this effort, doesn't introduce any changes, it only adds code pieces that'll be linked to wider logic changes in subsequent PRs.

This PR:

• Introduces useIdentityEffects "master" hook that encapsulates any automatic identity actions dispatch (for now, authentication, but in the future it will contain syncing effects)
• Introduces useAutoSignIn and useAutoSignOut hooks, that reactively manages the user's authentication state based on the current application state

Related issues

Related to:

• https://consensyssoftware.atlassian.net/browse/IDENTITY-25
• https://consensyssoftware.atlassian.net/browse/IDENTITY-52

Manual testing steps

1. No changes to test, the new code is not used yet

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Contributor Docs and MetaMask Mobile Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.