feat: added code spliting on main module

[holaontiveros]

Description

This adds the Main path of auth as a lazy loaded component so any app consuming this (as frontend-template-site) will have the related routes with code splitting

fixes openedx/frontend-base#162

How Has This Been Tested?

• Run this in dev mode and look for extra chunks in the networ requests

OR

• Add this repo as part of a parent aggregator project (use frontend-template-site as a quick headstart)
• Run the the frontent-base app and see that while accessing the related routes extra chunks of code are being fetch
• Pull any other route of this frontend-app if any work it should be the same for any other

Merge Checklist

• [ X ] Is there adequate test coverage for your changes? (if the actual tests work, then it's fine given that it's a loading related thing it either works or not)

Post-merge Checklist

• 🎉 🙌 Celebrate! Thanks for your contribution.

[openedx-webhooks]

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