PIMS-531: Absolute Imports for Express API starting the absolute paths

[LawrenceLau2020]

🎯 Summary

PIMS-531

Changes

• Adds ability to import absolute paths with the following prefix :@/. This corresponds to anything in the src folder.
• Added packages to allow for working builds and tests with these paths.
• Introduced a /src folder to house the API's code.

Testing

Ensure that it can be run in development mode, in a container, and that tests run.

Effects on Other Branches

Depending on what merges before this, imports in other branches and the folder structure of other branches will need to be changed.

🔰 Checklist

• I have read and agree with the following checklist and am following the guidelines in our Code of Conduct document.

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation where required.
• I have tested my changes to the best of my ability.
• My changes generate no new warnings.

[dbarkowsky]

for some reason the imports are failing in some of the tests.

I had a similar issue in another PR where jest keywords like describe weren't recognized. Had to restart VS Code, and TypeScript seemed to pick them up after.
Nvm. Misunderstood the issue.

[codeclimate]

Code Climate has analyzed commit 2135b7d and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 97.2%.

View more on Code Climate.

[dbarkowsky]

Approving this so we can move forward with other tickets. Contains big changes to folder structure that will have to be rectified in other branches.