chore: adds new initialize method and cleans constructor

[zone-live]

Explanation

We are removing the async call that existed in the constructor and moving it to a initialize method, the goal is to not have side-effects such as this call inside a constructor.

References

Ref slack conversation.
https://github.com/MetaMask/accounts-planning/issues/927

Changelog

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 communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes