change: move dapp inflationary rewards calculation from BeginBlock handler to keeper

[fdymylja]

Inflationary rewards are stored historically.

[codecov]

Codecov Report

Merging #186 (9169d6d) into main (a5d5b80) will increase coverage by 0.03%.
The diff coverage is 70.00%.

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
+ Coverage   56.82%   56.86%   +0.03%     
==========================================
  Files          15       17       +2     
  Lines        1209     1224      +15     
==========================================
+ Hits          687      696       +9     
- Misses        477      483       +6     
  Partials       45       45              

Impacted Files	Coverage Δ
x/gastracker/module/module.go	0.00% <0.00%> (ø)
...gastracker/keeper/keeper_contract_gas_processor.go	59.55% <59.55%> (ø)
x/gastracker/keeper/keeper.go	78.72% <73.07%> (+4.70%)	⬆️
x/gastracker/keeper/keeper_leftover_rewards.go	87.75% <87.75%> (ø)
app/app.go	90.25% <100.00%> (+0.02%)	⬆️
x/gastracker/module/abci.go	79.38% <100.00%> (-2.11%)	⬇️

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