Prototype implementation of SlashCommands

[drehtisch]

closes #79

[codecov[bot]]

Codecov Report

Merging #80 (2161f89) into main (9f5df4e) will decrease coverage by 4.73%. The diff coverage is 63.34%.

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   76.18%   71.45%   -4.73%     
==========================================
  Files          29       28       -1     
  Lines        1348     1482     +134     
  Branches      140      157      +17     
==========================================
+ Hits         1027     1059      +32     
- Misses        283      386     +103     
+ Partials       38       37       -1     

Impacted Files	Coverage Δ
...orgianStates/Services/BackgroundServiceRegistry.cs	0.00% <0.00%> (ø)
CyborgianStates/Services/DumpDataService.cs	7.29% <ø> (+7.29%)	:arrow_up:
...s/MessageHandling/Discord/DiscordMessageHandler.cs	44.48% <23.35%> (-50.41%)	:arrow_down:
CyborgianStates/Commands/NationStatsCommand.cs	89.31% <92.30%> (+0.74%)	:arrow_up:
CyborgianStates/Services/BotService.cs	93.96% <92.30%> (-1.10%)	:arrow_down:
CyborgianStates/Commands/RegionStatsCommand.cs	79.50% <96.66%> (+15.54%)	:arrow_up:
...borgianStates/CommandHandling/CommandDefinition.cs	100.00% <100.00%> (ø)
CyborgianStates/CommandHandling/CommandHandler.cs	100.00% <100.00%> (ø)
CyborgianStates/CommandHandling/CommandResponse.cs	100.00% <100.00%> (ø)
CyborgianStates/Commands/AboutCommand.cs	100.00% <100.00%> (+14.28%)	:arrow_up:
... and 10 more

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