perf: Reduce component structure check overhead

[bdunderscore]

Previously, we issued change events whenever component order changed; this resulted in spurious invocations of listeners,
which when did (potentially very expensive) redundant checks of what components were in their children. In particular, this
was done whenever a component changed; this was probably a bug, as a change event on the GameObject is issued when
component order changes.

This change makes a few adjustments to fix this:

• We record the child component list in the ShadowGameObject, and only generate change events if it actually changes.
• We only perform component structure checks when game objects change, not when the components themselves change.
• We avoid registering complex filters for component structure events; those filters were expensive, frequently redundantly
  registered, and are no longer needed with the new ShadowGameObject component tracking.

Closes: #513

perf: Remove redundant listener filters for MonitorGetComponents

Now that the shadow hierarchy is checking for component structure changes, we don't need to perform these checks in SingleObjectQueries.

Avoiding doing these checks there avoids redundant processing, which is particularly important since these will all generally
converge into the same invalidation.