Feat/backend/switching from bigcache to go redis

[waveyboym]

Description

This pr proposes changing from bigcache to go-redis

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

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

• Converted the vast majority of database functions to use go-redis and mock go-redis
• Wrote new unit tests for some functions in utils and cache

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 68.18182% with 35 lines in your changes missing coverage. Please review.

Project coverage is 73.39%. Comparing base (b831e09) to head (02dd82d).
Report is 20 commits behind head on develop.

Files	Patch %	Lines
occupi-backend/pkg/database/database_helpers.go	50.00%	31 Missing ⚠️
occupi-backend/pkg/cache/cache.go	91.48%	4 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (b831e09) and HEAD (02dd82d). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (b831e09)	HEAD (02dd82d)
	3	2

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #334      +/-   ##
===========================================
- Coverage    79.27%   73.39%   -5.89%     
===========================================
  Files           53       21      -32     
  Lines         3209     2507     -702     
  Branches        81       81              
===========================================
- Hits          2544     1840     -704     
- Misses         577      578       +1     
- Partials        88       89       +1     

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