Add storage layer to handle time-series data

[nakabonne]

I just settled on stop sending results from the attacker to the drawer directly. From now all data points are inserted into a new storage layer and the drawer periodically queries to that storage.

The storage is backed by https://github.com/nakabonne/tstorage

[codecov-commenter]

Codecov Report

Merging #105 (6b70223) into master (b651fdb) will decrease coverage by 7.97%.
The diff coverage is 33.56%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
- Coverage   71.55%   63.59%   -7.96%     
==========================================
  Files           9       11       +2     
  Lines         615      703      +88     
==========================================
+ Hits          440      447       +7     
- Misses        140      220      +80     
- Partials       35       36       +1     

Impacted Files	Coverage Δ
gui/drawer.go	58.27% <0.00%> (-15.75%)	⬇️
gui/keybinds.go	51.62% <0.00%> (ø)
storage/storage.go	0.00% <0.00%> (ø)
main.go	67.92% <8.34%> (-3.67%)	⬇️
storage/fake_storage.go	50.00% <50.00%> (ø)
attacker/attacker.go	70.97% <77.56%> (+3.18%)	⬆️
gui/gui.go	73.74% <85.72%> (+0.83%)	⬆️
attacker/fake_attacker.go	100.00% <100.00%> (ø)
gui/widgets.go	60.98% <100.00%> (ø)
... and 1 more

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