Remove default implementations of methods in WorldQuery.

[andriyDev]

Objective

• WorldQuery currently has two methods init_nested_access and update_archetypes that are default implemented.
• These methods have an important role in the safety of implementing WorldQuery. Forgetting to set these can be dangerous.

Solution

• Don't default initialize these methods!
  • Even if most implementations of these methods do nothing, WorldQuery is highly unsafe to get wrong, so having implementors specifically implement these to be empty is good!