Add register auth route

[juancwu]

Description

Route that handles user registration. This route is not complete. The PR a here to allow reviews to improve/change things that must be done during registration.

As of now, the request body validation is not done via a middleware but should be updated once it is merged.

The response body is just a generic map at the moment because the login route shares the same struct. For this reason, the response body should be updated to use the same one as the login route to save memory space.

More tests need to be added and will be added once the login route PR gets merged and also the validator middleware is merged.

Linked Issues

• Closes [BE Feat] Create Register authentication endpoint #180

Testing

• Tested the /api/v1/auth/register route that returns a 201 on success.

Checklist

Before opening this PR, make sure the PR:

• Has an assignee or group of assignees.
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• Has an assigned milestone.

Additionally, make sure that:

• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• Any dependent changes have been merged and published in downstream modules.

[AmirAgassi]

lgtm