feat: add rewards bucket keeper logic + tests

[snobbee]

• Add Rewards Bucket functionality to CLP Keeper.
• Add queries to rewards bucket list and single denom.
• Add unit tests.

[codecov]

Codecov Report

Merging #3426 (4276cd2) into master (0c63583) will increase coverage by 0.42%.
Report is 7 commits behind head on master.
The diff coverage is 70.58%.

@@            Coverage Diff             @@
##           master    #3426      +/-   ##
==========================================
+ Coverage   43.35%   43.77%   +0.42%     
==========================================
  Files         166      168       +2     
  Lines       15895    15987      +92     
==========================================
+ Hits         6891     6999     +108     
+ Misses       8591     8571      -20     
- Partials      413      417       +4     

Files	Coverage Δ
app/app.go	94.08% <100.00%> (+3.97%)	⬆️
cmd/sifnoded/cmd/ibc-diag.go	15.74% <ø> (ø)
x/clp/keeper/rewards_bucket.go	100.00% <100.00%> (ø)
x/clp/types/codec.go	100.00% <ø> (ø)
x/clp/types/key_rewards_bucket.go	100.00% <100.00%> (ø)
x/clp/types/keys.go	84.21% <100.00%> (+0.87%)	⬆️
x/clp/types/querier.go	100.00% <ø> (ø)
x/dispensation/types/types.go	100.00% <100.00%> (ø)
x/ibctransfer/helpers/conversion_helper.go	37.19% <ø> (ø)
x/ibctransfer/keeper/msg_server.go	86.95% <ø> (ø)
... and 6 more

... and 2 files with indirect coverage changes

[pgoos]

why it doesn't return any value?

[snobbee]

@pgoos when calling return it will return the variables that are defined in the signature of the function, you can see the return variables defined on the right:

(list []types.RewardsBucket)

[pgoos]

AMAZING work @snobbee 🚀