Description

This PR implements the core changes seen in this PR.
In short, this changes the implementation of AuthenticationController so that it can manage parallel sessions based on entropySource.
In turn, this addition permits UserStorageController to scope user storage requests to a specific entropySource.

Using all those changes, account syncing now iterates over each entropySource present in the client and syncs accounts in consequence. This will ensure that each SRP has its own data, that can be synced independently of the context (e.g Device 1 (SRP 1 + SRP 2), Device 2 (SRP 2 only) will bi-directionally sync).

Related issues

Fixes:

• https://consensyssoftware.atlassian.net/browse/IDENTITY-43
• https://consensyssoftware.atlassian.net/browse/IDENTITY-102

Manual testing steps

1. Import or create an SRP, complete onboarding, add and rename an EVM account
2. Import a second SRP, add and rename an EVM account
3. Uninstall and reinstall extension, onboard with one or both previous SRPs
4. Verify that EVM accounts are restored

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.