Remove Token Authentication Logic

[alysivji]

What does this do

• Delete the ApiUser model which was used to hold API Tokens
• Remove @authentication_required decorator -- do not need it anymore
  • if we do need it again, can always add this code back in

Why are we doing this

• Removing dead code from the codebase

How should this be tested

Do tests pass? We are good.

Migrations

Removing a column and deleting a table.

Dependencies

n/a

Callouts

n/a

[codecov-io]

Codecov Report

Merging #255 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
- Coverage   97.27%   97.20%   -0.07%     
==========================================
  Files          67       65       -2     
  Lines        1760     1716      -44     
==========================================
- Hits         1712     1668      -44     
  Misses         48       48              

Impacted Files	Coverage Δ
busy_beaver/models/__init__.py	100.00% <ø> (ø)
busy_beaver/models/task.py	100.00% <ø> (ø)

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