ENG 533 add Enable Inflation param

[danburck]

Description

This PR adds an enableInflation param and skippedEpochs counter.

Closes ENG-533

[linear]

ENG-533 Inflation favors users and validators when claims dashboard doesn't work

To prevent users and validators huge APY while we get the claims dashboard up and running, we can add a enableInflation parameter. Epochs counting should be halted when this param is set to false

[codecov]

Codecov Report

Merging #369 (503d6db) into main (6306f00) will increase coverage by 0.04%.
The diff coverage is 80.88%.

@@            Coverage Diff             @@
##             main     #369      +/-   ##
==========================================
+ Coverage   77.37%   77.42%   +0.04%     
==========================================
  Files          90       90              
  Lines        5317     5373      +56     
==========================================
+ Hits         4114     4160      +46     
- Misses       1052     1058       +6     
- Partials      151      155       +4     

Impacted Files	Coverage Δ
x/inflation/types/genesis.go	78.57% <41.66%> (-11.76%)	⬇️
x/inflation/keeper/epoch_info.go	70.00% <70.00%> (ø)
x/inflation/types/params.go	88.88% <81.25%> (-1.74%)	⬇️
x/inflation/keeper/grpc_query.go	84.21% <100.00%> (+4.21%)	⬆️
x/inflation/keeper/hooks.go	94.20% <100.00%> (+2.20%)	⬆️
x/inflation/keeper/keeper.go	89.47% <0.00%> (+10.52%)	⬆️

[fedekunze]

Looks good! can you also update the spec? 🙏

[fedekunze]

@danburck we also need to add a migration logic since we are adding a new param

[fedekunze]

ACK! can you run:

make proto-gen
make proto-swagger-gen
go mod tidy