fix: array callables + collect()

[kbond]

This pull request enhances the collect() function to handle callable sources more robustly and improves type safety and test coverage. The main focus is on distinguishing between arrays and callables, ensuring the correct collection type is returned, and thoroughly testing these behaviors.

Enhancements to collect() function:

• Improved callable detection and handling:
  • The PHPStan return type annotation for collect() was updated to correctly prioritize callables over arrays, ensuring that callable sources are always treated as such.
  • The implementation now checks if the source is callable before checking for arrays, returning a LazyCollection when appropriate.

Testing improvements:

• Added comprehensive tests for collect():
  • New tests verify that callables, arrays, traversables, Doctrine collections, and already-instantiated collections are handled as expected, ensuring correct instantiation and behavior for each source type.
  • Helper methods and global functions were added to support these new test cases.
  • Additional type assertions were added to the stubs to verify static analysis expectations for various usages of collect().

Test utilities and imports:

• Added necessary imports for new collection types to the test suite, supporting the expanded test coverage.