Add authentication from ims-api #6

[joelvdavies]

Description

Adds authentication that functions in the same way as inventory-management-system-api does. The majority of this code is copied directly from there. Tested with ral-facilities/inventory-management-system#1028.

Changes I made here have also been made on ims-api: ral-facilities/inventory-management-system-api#408.

Also had a think about the change to using the /verify endpoint instead. The main issue I currently see is handling the e2e tests - we would not be able to run them in the current format without also having ldap-jwt-auth running/a mock endpoint as we would presumably want all requests to be denied if /verify is unreachable. I think this needs further investigation & discussion as it will also effect ral-facilities/inventory-management-system-api#399. So I did not attempt to implement this here yet.

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage

Agile board tracking

Closes #6

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.18182% with 3 lines in your changes missing coverage. Please review.

Project coverage is 98.01%. Comparing base (292e4ec) to head (94ba5ef).

Files with missing lines	Patch %	Lines
object_storage_api/core/consts.py	75.00%	2 Missing ⚠️
object_storage_api/core/config.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #58      +/-   ##
===========================================
- Coverage    98.70%   98.01%   -0.70%     
===========================================
  Files           19       21       +2     
  Lines          310      352      +42     
===========================================
+ Hits           306      345      +39     
- Misses           4        7       +3     

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