feature/throughput logging

[euanwm]

Added middleware to capture the size of payload return to clients for all endpoints.
Extended the functionality on the discord bot to post the current total of data served.
Added functionality to allow for a shutdown sequence during instance restarts.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 66.82%. Comparing base (bb120f4) to head (45681fa).
Report is 6 commits behind head on development.

Files with missing lines	Patch %	Lines
backend/structs/struct_funcs.go	0.00%	22 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #408      +/-   ##
===============================================
- Coverage        69.25%   66.82%   -2.44%     
===============================================
  Files               18       18              
  Lines              605      627      +22     
  Branches             5        5              
===============================================
  Hits               419      419              
- Misses             173      195      +22     
  Partials            13       13              

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