Make container optional

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[what-the-diff[bot]]

PR Summary

• Introduction of a Custom Exception Class A new file ContainerNotSetException.php has been added. This file introduces a new custom exception class. An 'exception' is just a term to indicate an unusual or exceptional condition that needs handling.

• Changes to the 'Injector' File Several changes have been made to the Injector.php file:

  • The $container property type has been changed to ?ContainerInterface, which essentially means that it can now also accept 'null' as a value, giving it more flexibility.
  • The constructor of the file has been updated, so the $container parameter does not always need to be specified. This makes the project easier to work with.
  • A safety check has been introduced to throw a ContainerNotSetException if there is no container set while trying to establish an object parameter.

• Tests for the 'Injector' Behavior New test cases have been added to the InjectorTest.php file:

  • They test how the functionality of the 'injector' behaves when there is no container available. This helps to capture any bugs or issues.
  • An additional test case confirms that an exception is correctly thrown when resolving an object parameter in the absence of a container. This helps to ensure the smooth running of the program.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1f7239d) 100.00% compared to head (a267d94) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #86 +/- ## =========================================== Coverage 100.00% 100.00% - Complexity 88 89 +1 =========================================== Files 3 3 Lines 211 211 =========================================== Hits 211 211 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[roxblnfk]

It would be nice to improve the MissingRequiredArgumentException - add a flag whether the Container is passed to the Injector.

And if the Container is not passed, and the argument being resolved is a class, then output a friendly message (FriendlyException) will be like "pass an object of the required type as an argument to invoke()/make() or pass a Container when creating the Injector"

If the Container parameter was set, then the friendly message will be like "add an object of the required type to the argument list or make sure that the configured Container can resolve it"