GET and POST Learner Routes + Testing

[chnnick]

ℹ️ Issue

Closes #42

📝 Description

Write a short summary of what you added. Why is it important? Any member of C4C should be able to read this and understand your contribution -- not just your team members.

Briefly list the changes made to the code:

1. Created Learner Entity
2. Created Learner Controller
3. Created Learner Service
4. Created Learner Module
5. Created Learner Factory, as well as testing/factories folder for testing
6. Created tests for Entity and Controller

✔️ Verification

What steps did you take to verify your changes work? These should be clear enough for someone to be able to clone the branch and follow the steps themselves.
Tests pass, they all check for correct creating and fetching of Learner information

Provide screenshots of any new components, styling changes, or pages.

🏕️ (Optional) Future Work / Notes

• Currently have a hardcoded DTO being used for learner information, wasn't sure if there was a shared folder yet that I should create to put it in, but will be an easy fix.