Rename package

[xepozz]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️
Related PR	yiisoft/queue#184

The failed test still fail in master, I'll try to fix it separate

TODO:

• Replace yii-queue in composer.json after renaming the yii-queue package and before merge current PR

[what-the-diff]

PR Summary

• Name and Namespace Changes
  The package name has been changed from "Yii Queue AMQP Adapter" to "Queue AMQP Adapter". Correspondingly, multiple files had their namespaces updated and even the class DelayedMiddleware was renamed to DelayMiddleware for accuracy.

• Files and Directory Reorganization
  To improve code readability and maintenance, several files were moved to different directories, effectively organising them better.

• Code Improvements
  Some adjustments and updates were made in the code for better performance and readability. Also, the software's dependencies were updated, which aids in maintaining the software's compatibility with recent versions of related tools or libraries.

• Documentation Updates
  The documentation related to the project was also updated to reflect these changes. This is crucial for the understanding of any new developer who comes onto the project.

• Dockerfile and Test Files Update
  The Dockerfile has been updated to firstly copy composer files to /app/ before the composer install command is run, ensuring smoother operations. Additionally, various test files in the tests/Unit folder were either added or updated to make sure that newly introduced changes are working as expected.

• use Statement Updates
  The use statements in the list of unit test files were updated to reflect the new namespace, Yiisoft\Queue\AMQP, ensuring all components and features of the package can interact properly.

Please note that all changes are done keeping in mind not only the performance of the package, but also the code's readability, clarity and maintainability.