Restructured the directories and files

[rachit-goyal1071]

Fixes

Related to #16 by @Utkarsh4517

Description

Folders have been restructured as mentioned, bloc architecture has not yet been started will work on it soon.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

[Utkarsh4517]

Keep the auth_service in lib/src/auth/data.
Only keep those services in core which are used by more than one feature.

[Utkarsh4517]

While I appreciate your time and effort, but this is an incomplete PR related to issue #16. Feel free to ask your doubts at #16. 👍🏼