refact(backend-lifespan): improving type checking and incorporating lifespan as an alternative to on_event

Krr0ptioN commented 4 days ago

Description

This PR aims to resolve few type checking errors and replacing deprecated features of Fast API with new alternative ones.

Replacing existing ‍on_event for graceful shutdown and disposability with lifespan.
Improving type checking and eliminating linting errors

[X] My code follows the code style of this project.
[ ] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[ ] I have added tests (stories, interaction tests, unit tests, e2e tests) to cover my changes.

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