Change tracking on components holding handles to assets don't trigger when the asset handle transitions from the loading to the loaded state

## Bevy version

0.5

## Operating system & version

Windows 10

## What you did

Have a component hold a `Handle` of some asset. In my case, I'm working on integration with the Synthizer audio library and have Sound components which take in a handle to the `Buffer` of audio to use.

When the asset finishes loading, then the behaviour I wanted is for the sound to e.g start playing

Hence, I have a query on `Changed` to know when Sound components have been changed and logic should be rerun.

## What you expected to happen

Change tracking work for resource handles on components when they transition from loading to loaded states.

## What actually happened

Change tracking doesn't work in this case.

## Additional information

Any additional information you would like to add such as screenshots, logs, etc.

No source file or test is named. Start by reproducing the reported case with a component holding a Handle and a Changed query, then trace the handle's loading-to-loaded transition through change tracking. Done means the query detects that transition so dependent behavior can run.

Written by the indexing model from the issue text.