feat: network sync - add main sync logic

[Prithpal-Sooriya]

Explanation

This adds support for the "main-sync" on network syncing feature. This will get all a users local networks, and saved remote networks; then will append/update/delete networks synced across their devices.

We will add the controller integration in a following PR.

References

https://consensyssoftware.atlassian.net/browse/NOTIFY-1040

Changelog

@metamask/profile-sync-controller

• CHANGED: Renamed the sync.ts file to sync-mutations.ts
• ADDED: utils to the UserStorageController subpath.
• ADDED: findNetworksToUpdate() function which will perform the "main-sync" logic for local and remote network configurations.

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate

[mathieuartu]

Excellent job! I might re-use some of the way you laid out your logic, as I think it makes better sense for future use of the batch PUT endpoint.

Nice coverage as well, wooo