Allow parent reference in the same scene

[hadashiA]

In the LifetimeScope inspector, "Parent Type" can be specified, but this was not working in the same scene.

The reasons for this behavior are as follows

• You need to wait for your turn to Awake, which is complicated.
  • Difficult to report an error when Parent is not found because it waits for Parent to load.
• There is not much need to divide LifetimeScope into smaller parts.

However, I will still try to fix it so that it works within the same scene.

• The specification of not working in the same scene seems unexpected.
• Apparently, there is a requirement to narrow the scope, like Autofac's "Module" Zenject's "Sub Container"!

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