fix: 🐛 @constant now works with async recipes

[remimd]

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[Copilot]

Pull Request Overview

This pull request fixes the issue with the @constant decorator to properly support asynchronous recipes. It also updates the lazy evaluation functions to differentiate between synchronous and asynchronous usage and adds corresponding tests.

• Updated tests to verify that async recipes raise an error with get_instance and work with aget_instance.
• Modified the constant decorator to invoke alazy for async recipes.
• Refactored the lazy and Lazy implementations to support async evaluation.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/test_constant.py	Added tests for constant recipes with both sync and async functions.
injection/_core/module.py	Updated the constant decorator logic to choose between lazy/alazy based on function type.
injection/_core/common/lazy.py	Refactored lazy and added alazy functions along with changes in the Lazy class for async support.

Comments suppressed due to low confidence (2)

injection/_core/module.py:515

• Consider adding a comment explaining the conditional selection between alazy and lazy based on whether the recipe is asynchronous. This will improve clarity for future maintainers.

recipe: Recipe[[], T] = alazy(wp) if iscoroutinefunction(wp) else lazy(wp)  # type: ignore[arg-type]

injection/_core/common/lazy.py:7

• The lazy function now returns a callable rather than an Invertible instance. Ensure that all consumers of lazy are updated accordingly and that this change is reflected in the associated documentation.

def lazy[T](factory: Callable[..., T]) -> Callable[[], T]: