Add the schema versioning support and hot-reloading

[Piotr Karwatka]

What is the motivation for adding/enhancing this feature?

This could be a really cool feature to let the users to:

• add a way to version the API and manage the versioning on the module schema level: eg: https://shopify.dev/concepts/about-apis/versioning
• add new services (resolvers) without restarting the whole API (hot-reloads)

This is more RFC than FR