Feat/backend/limit login to one mobile device

[waveyboym]

Description

This pr attempts to introduce a feature whereby logging in and maintaining active sessions on more than one mobile device will now be impossible. Needs further review and feedback from @KamogeloMoeketse

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Various unit and integration tests were written hopefully increasing coverage and bringing the total up to 917 total tests for the backend

Checklist:

• My code follows the style guidelines of this project
• 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
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Attention: Patch coverage is 93.10345% with 6 lines in your changes missing coverage. Please review.

Project coverage is 94.24%. Comparing base (f1c0587) to head (89302de).
Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
occupi-backend/pkg/cache/cache.go	81.25%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #367       +/-   ##
============================================
+ Coverage    69.23%   94.24%   +25.01%     
============================================
  Files           55       11       -44     
  Lines         6143     3407     -2736     
  Branches        84        0       -84     
============================================
- Hits          4253     3211     -1042     
+ Misses        1833      147     -1686     
+ Partials        57       49        -8     

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