feat(x/rewards): Contract premium - Genesis

[vidhanarya]

Closes: #269

• Update genesis.proto to include flat fees data for contracts
• Update x/rewards genesis to import/export flat fees data to/from state
• Add tests

[spoo-bar]

Overall looks good. Couple small changes in code organization.
Havent gone through the tests yet.

[codecov]

Codecov Report

Base: 69.52% // Head: 69.88% // Increases project coverage by +0.35% 🎉

Coverage data is based on head (695fde7) compared to base (27adc29).
Patch coverage: 87.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
+ Coverage   69.52%   69.88%   +0.35%     
==========================================
  Files          61       61              
  Lines        3636     3692      +56     
==========================================
+ Hits         2528     2580      +52     
- Misses       1033     1038       +5     
+ Partials       75       74       -1     

Impacted Files	Coverage Δ
x/rewards/types/rewards.go	65.43% <68.75%> (+0.81%)	⬆️
x/rewards/types/genesis.go	75.28% <85.71%> (+5.94%)	⬆️
x/rewards/keeper/genesis.go	100.00% <100.00%> (ø)
x/rewards/keeper/state_flatfee.go	100.00% <100.00%> (ø)

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[vidhanarya]

@fdymylja Gentle reminder for review ^

[fdymylja]

Just a small nit and it should be good to go.

[fdymylja]

almost there!

[fdymylja]

thank you a lot!

dismissing because the concerns were addressed