Add INonLazy interface for immediate instantiation via RegisterEntryPoint

[Ceeeeed]

This PR introduces a new approach to support non-lazy initialization, inspired by previous discussions around the NonLazy() method. Instead of using a separate NonLazy() API, I provide an INonLazy marker interface.

Perhaps this approach will be more aligned with the repository owner's preferences. For reference, see the previous discussion: PR #574.

Key Points

• Types implementing INonLazy will be automatically instantiated when registered via RegisterEntryPoint, ensuring immediate construction.
• This avoids the need for empty Initialize() implementations solely to trigger early instantiation.
• Follows the existing pattern of RegisterEntryPoint(), maintaining API consistency and clarity.
• Includes unit tests demonstrating proper instantiation order and behavior.

Example Usage

public class MyListener : INonLazy
{
    public MyListener()
    {
        EventBus.Subscribe<MyEvent>(OnEvent);
    }

    private void OnEvent(MyEvent e)
    {
        // handle event
    }
}

// Registration
container.RegisterEntryPoint<MyListener>();
// MyListener is created immediately after container build

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Pull request overview

Adds a marker-interface-based mechanism to force eager (non-lazy) instantiation of certain entry points during EntryPointDispatcher.Dispatch(), plus a unit test demonstrating the behavior.

Changes:

• Introduce INonLazy marker interface under VContainer.Unity.
• Eagerly resolve INonLazy implementations at the start of EntryPointDispatcher.Dispatch().
• Add a Unity test fixture and test case validating immediate instantiation on Build().

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
VContainer/Assets/VContainer/Runtime/Unity/EntryPointDispatcher.cs	Forces resolution of INonLazy collection prior to running other entry point lifecycle phases.
VContainer/Assets/VContainer/Runtime/Annotations/INonLazy.cs	Adds the INonLazy marker interface.
VContainer/Assets/VContainer/Runtime/Annotations/INonLazy.cs.meta	Unity asset metadata for the new interface file.
VContainer/Assets/Tests/Unity/UnityContainerBuilderTest.cs	Adds a test asserting that a non-lazy entry point is instantiated during container build.
VContainer/Assets/Tests/Unity/Fixtures/SampleEntryPoint.cs	Adds SampleNonLazyEntryPoint test fixture implementing INonLazy.

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