feat(app)!: enforce min commission by changing default and genesis validation

[Unique-Divine]

Description

1. Changes the default value for staking.params.min_commission in the genesis.
2. Wraps the current genesis validation handler for x/staking to error if the minimum commission is nonpositive.

Purpose

• Closes feat(ante): set minimum commission percentage for validating #1588

[codecov]

Codecov Report

Merging #1613 (9e5b35a) into master (0c31eaf) will increase coverage by 0.51%.
Report is 3 commits behind head on master.
The diff coverage is 89.39%.

❗ Current head 9e5b35a differs from pull request most recent head 492ea94. Consider uploading reports for the commit 492ea94 to get more accurate results

@@            Coverage Diff             @@
##           master    #1613      +/-   ##
==========================================
+ Coverage   71.21%   71.72%   +0.51%     
==========================================
  Files         186      185       -1     
  Lines       14493    14562      +69     
==========================================
+ Hits        10321    10445     +124     
+ Misses       3520     3468      -52     
+ Partials      652      649       -3     

Files	Coverage Δ
x/perp/v2/keeper/keeper.go	92.42% <100.00%> (+1.35%)	⬆️
x/perp/v2/module/genesis.go	98.03% <100.00%> (+23.41%)	⬆️
app/modules.go	94.64% <76.92%> (-5.36%)	⬇️
x/perp/v2/keeper/clearing_house.go	77.41% <25.00%> (-0.08%)	⬇️
x/perp/v2/keeper/dnr.go	89.47% <88.57%> (+22.03%)	⬆️

... and 1 file with indirect coverage changes