Remove use of namespace, keep it inline

[edwinkortman]

Hello! :-)

I noticed a change in this module recently that caused our static analyse to return errors as the file generated by Codeception is no longer valid.

In this PR (https://github.com/Codeception/module-asserts/pull/7/files#diff-b3d3622a11b4688b45ee6999ce435bc0L178) a change was introduced that included the Throwable and Exception class via use instead of having it in the doc block as \Throwable and \Exception. Which is fine as the tests still run but when the support files are generated the use statements aren't copied causing the generated files to contain errors in the doc blocks (which continue into our tests, which are analysed for these sort of things).

This PR reverts the change of using the namespaces. The tests still work but it looks wrong to have a generated file that isn't correct. Let me know if you need more information or if there's an alternative solution!

Related screenshots from generated file:

This is part of the _generated/IntegrationTesterActions. Marked in yellow, Throwable as undefined class.

This is what it used to be, does not contain the undefined class.

[Naktibalda]

Thanks

[edwinkortman]

Thank you @Naktibalda