FTP Connection Management Optimization using Singleton Pattern (#213)

* Refactor data handling to improve performance and maintainability

* Fix ftp directory content load function

* Add docstrings to enhance code documentation and clarity

* chore(CI): fix CI workflows (#214)

* fix(CI): fix CI workflows

* run pre-commit

* include pre-commit before testing

* include pre-commit before commiting

* linting pt.1

* linting pt.2

* replace mocked tests by endpoint tests

* remove compose-go

* linting pt.3 final

* Refactor data handling to improve performance and maintainability

* fix: ftp directory content load function

* feat: docstrings to enhance code documentation and clarity

* fix: update `CACHE` to `DIRECTORY_CACHE`

* Refactor data handling to improve performance and maintainability

* Fix ftp directory content load function

* Add docstrings to enhance code documentation and clarity

* chore(CI): fix CI workflows (#214)

* fix(CI): fix CI workflows

* run pre-commit

* include pre-commit before testing

* include pre-commit before commiting

* linting pt.1

* linting pt.2

* replace mocked tests by endpoint tests

* remove compose-go

* linting pt.3 final

* Refactor data handling to improve performance and maintainability

* fix: ftp directory content load function

* feat: docstrings to enhance code documentation and clarity

* fix: update `CACHE` to `DIRECTORY_CACHE`

* chore(lint): improve code formatting and readability across multiple files

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Co-authored-by: Luã B. Vacaro <[email protected]>