Feature/add total results

[euanwm]

Major breaking change to the leaderboard API endpoint to allow for the total amount of lifters to be known in a filter query.

Schema:

{
    "size": int,
    "data": [{lift_data_1}, {lift_data_2}, {lift_data_etc}],
}

[euanwm]

@mountclear / @rsbrowne - It is done.

[codecov]

Codecov Report

Attention: 28 lines in your changes are missing coverage. Please review.

Comparison is base (9eb8a32) 91.11% compared to head (8c98c3f) 87.27%.

Files	Patch %	Lines
backend/dbtools/sortby.go	40.42%	26 Missing and 2 partials ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development     #270      +/-   ##
===============================================
- Coverage        91.11%   87.27%   -3.84%     
===============================================
  Files               11       12       +1     
  Lines              360      393      +33     
===============================================
+ Hits               328      343      +15     
- Misses              25       42      +17     
- Partials             7        8       +1     

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