Add Closures::unfold function

[RubenKluft]

Utility function to replace the repeated pattern of

  if ($this->service instanceof Closure) {
      $this->service = ($this->service )();
  }

  return $this->service ; 

That is often used to make lazy loaded services

[Copilot]

Pull request overview

Adds a new DR\Utils\Closures helper to “unfold” a closure into its resolved object value (memoizing by replacing the referenced variable), plus a unit test covering the new behavior.

Changes:

• Introduce Closures::unfold(object &$closure): object to resolve a Closure once and overwrite the referenced variable with the resolved object.
• Add ClosuresTest::testUnfold() to validate the new helper.

Reviewed changes

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

File	Description
src/Closures.php	Adds the Closures utility class with the new unfold method and PHPStan typing annotations.
tests/Unit/ClosuresTest.php	Adds a unit test for Closures::unfold.

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