feat(x/rewards): Contract premium - Wasmbindings

[spoo-bar]

Closes: #279

• Add msg plugin wasm binding for SetFlatFee
• Add query plugin wasm binding for FlatFee
• Wasmbindings tests
• Updated spec
• Updating keeper.SetFlatFee to perform the authorization check. (used to happen in msgSrvr before)

┆Issue is synchronized with this Jira Task by Unito

[codecov]

Codecov Report

Base: 69.88% // Head: 69.55% // Decreases project coverage by -0.33% ⚠️

Coverage data is based on head (ad93623) compared to base (b2c207b).
Patch coverage: 57.83% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
- Coverage   69.88%   69.55%   -0.33%     
==========================================
  Files          61       63       +2     
  Lines        3692     3758      +66     
==========================================
+ Hits         2580     2614      +34     
- Misses       1038     1068      +30     
- Partials       74       76       +2     

Impacted Files	Coverage Δ
wasmbinding/msg_plugin.go	62.96% <0.00%> (-5.04%)	⬇️
wasmbinding/query_plugin.go	78.37% <0.00%> (-4.48%)	⬇️
wasmbinding/types/msg.go	81.25% <0.00%> (-18.75%)	⬇️
wasmbinding/types/query.go	84.21% <0.00%> (-15.79%)	⬇️
wasmbinding/rewards/types/query_flatfee.go	33.33% <33.33%> (ø)
wasmbinding/rewards/types/msg_flatfee.go	40.00% <40.00%> (ø)
wasmbinding/rewards/msg_handler.go	85.71% <100.00%> (+3.36%)	⬆️
wasmbinding/rewards/query_handler.go	91.66% <100.00%> (+2.77%)	⬆️
x/rewards/keeper/flat_fee.go	100.00% <100.00%> (ø)
x/rewards/keeper/msg_server.go	100.00% <100.00%> (+4.00%)	⬆️
... and 1 more

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[fdymylja]

LGTM minor nit on API consistency.

[fdymylja]

LGTM! Amazing work!