Medibase: Drop littletable; instead store as list from ORM's values_list

[rithviknishad]

Proposed Changes

• MedibaseMedicineTable no longer uses littletable and is now simply a list fetched ORM's values_list

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[nihal467]

I tested in tunnel provided by @rithviknishad's and added multiple medicines to a patients looks good to me in a general view

[rithviknishad]

Gunicorn Worker timeout occurs as loading to in-memory on wsgi.py takes too much time for (0.25cpu)
No memory issues though.

[rithviknishad]

But this happens for me even with lazy load (load on first search request instead of on wsgi.py) on my CPU.
Probably because my 0.25 cpu is not same as staging instances 0.25 cpu

Same happens for me in master branch on my local too with 0.25 cpu; but works in staging.