Feat/backend/deep user based analytics

[waveyboym]

Description

This pr is a revamp and refactor is analytics based operations. We go from processing and crunching the data on the backend to doing the operations on the database, thereby hopefully introducing major performance improvements for big data computation. We use mongo db's aggregation functions for these operations.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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

• Unit tests and coverage for all analytics
• Unit test database functions which aggregate

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 99.79036% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.01%. Comparing base (48362e4) to head (a9f051b).
Report is 31 commits behind head on develop.

Files with missing lines	Patch %	Lines
occupi-backend/pkg/database/database.go	93.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #355      +/-   ##
===========================================
+ Coverage    88.53%   94.01%   +5.48%     
===========================================
  Files           53       11      -42     
  Lines         3392     3006     -386     
  Branches        84        0      -84     
===========================================
- Hits          3003     2826     -177     
+ Misses         303      136     -167     
+ Partials        86       44      -42     

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