ci(backend): add release please action

[aadil96]

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[what-the-diff]

PR Summary

• Implementation of Automated Releases: A new system named 'GitHub Actions workflow' has been introduced to automate future software releases. This means whenever new code is added to the main branch, a software release can be automatically generated.
• Establishment of Release Manifest: A manifest, which can be likened to a guide or blueprint for each release, has been established. This will set initial versions for different features or components of our software, in this case, the 'src/backend' package.
• Introduction of Release Configuration: A configuration file has been added to set parameters for each release. It essentially acts as a rule book for how to introduce new features or changes to the 'src/backend' package, and it includes details like the release type, package name, changelog path, and other necessary components.